Monday, January 20, 2020

Introduction to Second Sabbatical -- "Sorcerer Mathematicians of the Renaissance"

My first sabbatical was such an amazingly life-changing experience and has so positively impacted my students and my teaching, that it has been my dream to do something similar again.  During fall semester 2018 I worked hard to put together a worthy proposal, and approval was granted!
Cardano, Dee, and Napier
My previous sabbatical was focused on the history of mathematics from the Renaissance to the present in northern Europe, which was quite a wide sweep of history to try to take in.  This time my focus will be on three 16th-century mathematicians whom I refer to as "The Sorcerer Mathematicians of the Renaissance."  They are Girolamo Cardano (1501-1576), John Dee (1527-1609), and John Napier (1550-1617).
John Dee Exhibit, Royal College of Physicians, London 2016

John Dee's crystal ball
Prior to my first sabbatical I had not heard of John Dee -- embarrassing to admit, but there it is.  Thankfully, while I was in London the Royal College of Physicians was hosting a John Dee exhibit along with a variety of other Dee events. I found myself captivated.  A book on display there linked John Dee with one of my favorite Italian mathematicians, Girolamo Cardano. I later learned that they had met, despite a quarter-century difference in their ages and despite living at such a distance from each other at a time when long-distance travel was onerous, to say the least!  This link was the seed of the idea for this second sabbatical.
Dee's copy, with his marginal notes, of Scaliger's "critique" of Cardano
Additionally during those first travels I learned more of John Napier -- also a Renaissance-era mathematician with a reputation for dabbling in the dark arts.  How could I resist opportunity to study these three more deeply and in conjunction with each other?  (And if any mathematicians are going to capture the imaginations of my students, wouldn't it be these three?!  Crystal balls, castles, the Spanish Inquisition, codes, feuds, spy-craft, the occult, lost treasure, etc., etc., etc.)
John Napier's Tower House/Castle, Edinburgh, Scotland 2019
Beginning March 12, 2020, I will be "walking in the footsteps" of these mathematicians as closely as possible.  I will be visiting places where they lived, studied, worked, worshiped, and died.  I will read in library and museum archives, focusing especially on original documents such as diaries and letters.  I will attend any and all talks, tours and events that I can find relating to these mathematicians.

Mathematically I will be studying their work on their terms, as they wrote it and understood it.  The Renaissance Era was as much a rebirth and flowering of mathematics as it was of art, music and literature.  These three mathematicians were deeply involved in this flowering that gave rise to the mathematics (and thus the technology) that we have today.  For example, in 1545 Girolamo Cardano published Ars Magna, or The Great Art, an extremely influential mathematics text that is a basis of our modern algebra.  John Napier created logarithms, an invention that so shortened the time needed for calculations that he is said to have “doubled the life of the astronomer.”  John Dee worked with mathematics relating to navigation and calendar reform and is the first person to have used the term “British Empire,” a phrase he coined in his role as adviser to Queen Elizabeth I.

Though their mathematical contributions are profound, there is much more than mathematics that attracted me to these three.  John Dee may have been a spy for Queen Elizabeth I and is thought to have inspired Ian Fleming’s James Bond character as well as Shakespeare’s Prospero and Marlowe’s Dr. Faustus.  What kind of life must he have lived to have inspired such a diversity of fictional characters?!  Girolamo Cardano was the second most renowned physician of his day and was also a gambler and an astrologer who was imprisoned by the Inquisition for, ostensibly, casting a horoscope of Jesus Christ.  John Napier was an elder in his church, but he was also considered a sorcerer by his neighbors.  That was a very fine line to walk, particularly in the 16th century when people were burned at the stake for witchcraft. Because of his reputation as a sorcerer, he was contracted to use his skills to search for treasure in Scotland’s Fast Castle.  

There is a great deal more to what I am doing and exploring, but hopefully that gives a sense of the journey -- enough to tempt you to follow along!
Speaking of the journey, I had these maps up on the wall of my office all last semester in order to encourage and inspire myself.  Never having traveled prior to 2016, I learned in my first sabbatical that I'm a pretty "manic" traveler, don't know how to rest and take down time -- but I also don't necessarily want to rest or take down time because this is my chance to access so much!  I'll be staying in 11 different cities over the course of 8 weeks and will be taking side-trips to other cities as well.
In Italy my focus is mainly Cardano (though while I'm there I'll also look into Bruno, Fibonacci, Pacioli, Somerville, etc.).  I will be, at the very least, visiting the cities of

Rome
Naples
Florence
Vinci
Pisa
Bologna
Urbino
Venice
Padua
Milan
Sirmione
Pavia

In England I'll focus mainly on Dee, and in Scotland I'll focus mainly on Napier.  The cities I'll be visiting, at the very least, in the United Kingdom are


London
Oxford
Eyemouth
Edinburgh
Gartness
St. Andrews

I have been researching this with varying levels of intensity since my last sabbatical, and this research has now shifted into very high gear.  I need to go in with a lot of knowledge in order to get as much out of this as I possibly can.  I plan to begin regular blog posts a few days after landing in Rome on March 12, so watch this space in order to learn about those "Sorcerer Mathematicians of the Renaissance!"


PS  This blog is a continuation from my previous sabbatical, so all the posts from those travels can be found below.  





Friday, July 29, 2016

Introduction/Conclusion

Having concluded my mathematical travels, and desiring this blog to work as a reference for my students and to be comprehensible for others who come across it, I feel it's important to put up this final post in order to round things out and provide an overview.  This will serve as a conclusion for those of you who have followed me on my travels, and it will serve as an introduction for those of you just now finding this blog (including my future students).
Tram to from the airport into Edinburgh - my first stop in Europe
This blog covers my mathematical travels from spring 2016, which were undertaken as part of a sabbatical focused on the history of mathematics from the Renassaince to the present in northern Europe.  The map at the top of the post shows my stops.  These travels were profoundly impacting to me, and I believe the outcomes will resonate throughout my teaching over the rest of my teaching career.  Multiple goals were achieved through this travel, but one of the biggest is that of having walked in the footsteps of the famous mathematicians from the last 500 years in such a way that I will be able to bring them to life for my students.  I hope that through doing this I will be able to help make math more approachable and interesting to my students and to people in my community by truly putting a human face on mathematics.

I hope this final post relating to my mathematical travels in northern Europe will serve as a sampler of what is to be found in the previous posts of this blog.  I will include some links here to other posts, as well as a wide variety of pictures.  There is also a search bar on the top left, and a list of labels on the right that can be used to search for specific topics, places and people of interest.  ENJOY!
 Mathematician Mary Somerville (1780-1872), who eventually tutored Ada Byron (yes, that Byron), who was to become a mathematician herself.  Mary grew up in Burntisland, Scotland.  Part of what inspired Mary to study mathematics was the natural world around her - especially stars she could see out of her bedroom window and the Burntisland beach and tide pools near her childhood home.
 My intent was to walk in the footsteps of the mathematicians I was studying, and I did that very literally!  I wanted to experience what inspired them so I can use it to inspire others!
Mary had extended family who lived further south in Scotland, in the borderland town of Jedburgh.  Her uncle was the minister at Jedburgh Abbey (seen in ruins above) and lived on the Abbey grounds.  Mary and her cousins would swim in the Jedwater (also seen in the picture above).

As well as having walked in Mary's footsteps, I also accessed her papers and read correspondence between the Somerville and Byron/Lovelace families housed in Oxford's Bodleian Library.  The lives of Mary Somerville and Ada Byron Lovelace opened up before me in amazing ways as I read their letters to each other.
The Radcliffe Camera - one of the Bodleian Reading Rooms in Oxford
A folder containing correspondence between Mary Somerville and Ada Byron Lovelace
 While in Oxford I also accessed the archives at Queen's College Library.  Here I found the rumors that mathematicians are lazy to be confirmed for me!  In reading a first edition copy of Robert Recorde's Whetstone of Witte, I came across the place where the equals sign was used for the first time.  Recorde wrote that he decided to create the equals sign because he was tired of the "tedious repetition"of writing the words "is equalle to" between both sides of all of his equations. He created that small symbol = that we all recognize immediately today.  He decided to make the symbol of two parallel lines of the same length, as he put it, "bicaufe noe.2. thynges can be moare equalle." (The reading of 16th century English proved a bit challenging, but in a fun way, like a treasure hunt!)
The view from my table at Queen's College Library, Oxford
My table at Queen's College Library, Oxford, with the 1557 first edition Whetstone of Witte waiting for me
 I chose each of my destinations solely with regard to connections with mathematics and mathematicians.  Another mathematician I was interested in at Oxford is a person most of us know better as a literary figure: Lewis Carroll.  Actually, his "day job" was that of being an Oxford don of mathematics - on the side he was a writer and photographer - very accomplished in those areas!
 Carroll's Alice stories were inspired by a real person, Alice Liddell, the young daughter of Carroll's dean at Christ Church, Oxford.  Carroll often took Alice and her sisters boating and also to the then newly opened Oxford University Museum of Natural History (see above), where they encountered some of the "beasts" that make an appearance in his works (see below).
Lewis Carroll is not the only whimsical mathematician I came across in my study and travels, another such is Dr. John Dee (1527-1608).  Given what I've learned I can't believe I hadn't come across him before; he's everywhere in popular culture - appears frequently in modern fantasy, horror, and historical fiction novels, may have been the model for Prospero in Shakespeare's Tempest and Christopher Marlowe's Doctor Faustus.  He even shows up in an Iron Maiden song and a PlayStation video game!

Dr. Dee was an adviser to Queen Elizabeth I.  At the time in which he lived science and magic were not well-distinguished, and scholars such as himself could be expected to do such things as draw up horoscopes and cast out demons.  Though this was expected, it put men such as he in danger of being associated with the occult, which did happen to him.  He then fell out of favor with the Queen and died in poverty and obscurity.  And yet, as we've seen, he lives on in literature, music, games and even an opera!

Pictured below are some of his mystical implements, including his crystal ball and obsidian scrying mirror.  These items were on display at London's Royal College of Physicians, on loan from the British Museum.
Dee is not the only mathematician of this era to have been considered by some to be a sorcerer.  Another such is John Napier (1550-1617), a Scottish nobleman and elder in the Presbyterian Church, whose castle tower is pictured further down in this post.

As well as visiting beaches, museums, libraries and universities where mathematicians lived, worked and gained inspiration, I also visited gardens, woodlands, crypts, castles, cemeteries, cathedrals, homes and classrooms associated with mathematicians and their lives - some photographs of which follow this paragraph.  Also included in the posts on this blog are commentary about the very real joys and very significant struggles of traveling abroad for the first time and traveling solo.  Although the travels were independent and solo there were three cities in which I met with fellow mathematicians who proved to be of tremendous help to me, so this post closes with pictures of each of them to whom I feel tremendous gratitude!
Tuileries Garden, Paris, where Mary Somerville spent time convalescing
Forest of Gottingen, Germany where David Hilbert walked with colleagues and students
Crypt of the Pantheon in Paris - tomb of Joseph Louis LaGrange (top, left, back)
Merchiston Tower - which remains of the castle of John Napier
Pere Lachaise Cemetery, Paris - burial place of Germain and Fourier
Window dedicated to George Goole in Lincoln Cathedral
View out of Sir Isaac Newton's bedroom window of the famous apple tree that he said inspired him
Cavendish Laboratory Classroom of James Clerk Maxwell - Cambridge
Dr. Piers Bursill-Hall & doctoral student Richard Chapling - Centre for Mathematical Sciences - Cambridge
Dr. Samuel James Patterson  - Mathematisches Institut - Gottingen, Germany
Dr. Manfred Stern of Halle, Germany and I having lunch and talking math at the famous Auerbachs Kellar, Leipzig


Thursday, July 28, 2016

Bletchley Park and Alan Turing


Bletchley Park "Mansion" from across the pond
My sabbatical travels were such a whirlwind that I didn't realize until long after I got home that I hadn't posted about my visit to Bletchley Park, the main site for British code-breaking during World War II, and its most famous code-breaker, mathematician Alan Turing.  The photographs above and below this paragraph are of "The Mansion," which was built in about 1880 as a modest gentleman's residence but was expanded in the late 1800s and early 1900s as a "country house."  It was bought by the Secret Intelligence Service (M16) in 1938 - one reason for this choice of location was that it was on the "Varsity Railroad Line" which ran between Oxford and Cambridge - providing easy access for mathematicians and other code-breakers from these universities.
A bit of the grounds at Bletchley Park
The Mansion

I found both the exterior and the interior to be absolutely exquisite!  Though it has been called by some a "maudlin and mounstrous pile" because it combines Victorian Gothic, Tudor and Dutch Baroque styles.  Though construction on this mansion didn't begin until 1878, residence on this site goes back at least as far as the Domesday Book of 1086, when it was part of the Manor of Eaton.
It's hard to estimate the full value of the work that was done here.  Until fairly recently it was Britain's "best kept secret."  Secrecy surrounding the activity done here was vital to national security and to victory in WWII.  As the plaque below expresses the intelligence work done here saved countless lives and helped significantly shorten the war.

One benefit of this location is that it includes extensive grounds that could be used for recreation from their intense work by the mathematicians and other intelligence workers and staff that were housed here.  The pond, seen in the first image in this post, would freeze over in winter and be used for ice-skating.  There are also tennis courts on the grounds.
Below is a view of the cottages where Turing and others made breakthroughs on the German Enigma Code.  Also included are photographs of some informational signage from this area.
The Cottages, Bletchley Park
Turing, a fellow of Trinity College, Cambridge, was instrumental in developing The Bombe which functioned to discover daily settings of the German Enigma machines.  Among other influences he was inspired in his work in logic and computing by the work of Charles Babbage and Ada Byron Lovelace (whose powerful story I have blogged about here).  Pictured below is a replica of The Bombe, which is on display in The Mansion.  It is a prop from the 2014 movie about these events and this era "The Imitation Game," starring Benedict Cumberbatch.
As well as the mansion and the cottages, which already existed on the site when M16 bought the estate, many huts were built to house specific aspects of the intelligence work going on at B.P. (as it was affectionately known by those who worked there).  For instance, Hut 4 dealt with Naval Intelligence, Hut 7 dealt with the Cryptanalysis of Japanese Naval Codes, Hut 2 was for "beer, tea, and relaxation," and Hut 11 was for Bombe Building. 
Alan Turing was a brilliant mathematician who contributed much to mathematics, to the foundations of computer science, and to the war effort.  He is widely acknowledged as the Father of Modern Computing and also as the Father of Artificial Intelligence.    His "Turing Machine"can be considered a model of a general purpose computer.  In 1951 he was elected a member of the Royal Society of London.  Yet for all that he contributed, because of the secrecy of the war effort his contributions could not be recognized in his time.  Additionally, his life ended tragically.

In 1952 Turing, who was homosexual, met a young man with whom he began a relationship.  An acquaintance of his partner robbed Turing's house.  Turing reported the robbery to the police, and during questioning it came out that he was in a homosexual relationship.  At that time homosexual acts were considered criminal offences in England, and Turing was charged with "gross indecency."  He plead guilty and was given a choice between imprisonment or probation which would include hormonal treatments with estrogen to suppress his libido.  The conviction also led to the loss of his security clearance, and it barred him from further cryptographic consulting for the British government.  He was also denied entry into the United States after this conviction.

Two years after his conviction his housekeeper found him dead in his home.  He had died of potassium cyanide poisoning.  There is some doubt as to whether his death was accidental or if it was suicide.  He was working with electrolysis experiments at the time and may have accidentally ingested it.  His mother maintained that his death was accidental.  But a half eaten apple was found by his bedside when his body was discovered, and, according to his biographer David Leavitt, his favorite fairy tale was Snow White and the Seven Dwarfs, and, in Leavitt's words, Turing took "an especially keen pleasure in the scene where the Wicked Queen immerses her apple in the poisonous brew."

Mathematician and artist Lidia Luquet, captured this tragedy well in her painting, pictured below, a Magritte homage which brought me to tears when I saw it displayed at a conference at U.C. Davis early in my sabbatical semester (more about that at this link).

One last look at The Mansion
There are a number of excellent movies about the life of Alan Turing and/or the work at Bletchley Park.  One of these is the 2014 film The Imitation Game starring Benedict Cumberbatch, another is the 2001 film Enigma starring Dougray Scott and Kate Winslet, and my favorite is the 1996 BBC production Breaking the Code: Biography of Alan Turing starring Derek Jacobi (which can be found at this link on youtube).