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James Joseph Sylvester

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James Joseph Sylvester was a foundational English mathematician of the 19th century. He made essential contributions to several complex fields. These included matrix theory, invariant theory, number theory, partition theory, and combinatorics. His work helped organize the way mathematicians describe patterns and structures. Beyond his own research, he was a major leader in the mathematical community. He served as a professor at Johns Hopkins University in America. He also founded the American Journal of Mathematics to help scholars share ideas.

Sylvester's mathematical legacy is largely defined by the language he created. He invented many technical terms that are still standard in modern mathematics. In 1850, he coined the word "matrix" to describe specific arrangements of numbers. He also introduced the term "graph" to describe networks. In 1851, he created the word "discriminant" for use in algebraic theory. He later named the "totient" function to describe specific properties of numbers. By providing these names, he allowed mathematicians to communicate complex ideas with precision.

His life was marked by significant challenges due to his religious identity. Sylvester was born in London on September 3, 1814, to a Jewish family. This identity caused obstacles during his academic career in England. Although he ranked second in the famous Cambridge mathematical examination called the tripos in 1837, he was denied a degree. At that time, graduates had to accept the Thirty-nine Articles of the Church of England. Because he was Jewish, he could not do this. He was also unable to compete for a Smith's prize or a Fellowship at Cambridge. He did not finally receive his B.A. and M.A. from Cambridge until 1872.

Sylvester's career also included a period of intense conflict in the United States. In 1841, he moved to the University of Virginia. He became the first Jewish professor at any American college or university. However, his time there lasted only four months. A classroom incident occurred where a student hit him with a bludgeon. Sylvester struck back with a sword-cane. The student collapsed in shock, and Sylvester wrongly believed he had killed him. He resigned because he felt the university did not discipline the student enough.

After leaving Virginia, Sylvester lived in New York City and built connections with other scholars. He befriended the mathematician Benjamin Peirce and the physicist Joseph Henry. He attempted to become a professor at Columbia College in 1843. However, he was denied the position because of his Judaism. He returned to England and found a different path in the business world. In 1844, he worked for the Equity and Law Life Assurance Society. He developed successful actuarial models for the company. He even served as the de facto CEO of the society.

During his time in the insurance industry, Sylvester studied for the Bar. This led him to meet the mathematician Arthur Cayley. The two men entered a long and productive collaboration. They made significant contributions to both invariant theory and matrix theory. Sylvester also spent years as a professor at the Royal Military Academy in Woolwich. He taught there from 1855 until his retirement in 1869. During this period, he also engaged in a public controversy regarding his pension. He used the letters page of The Times to defend his rights.

Sylvester was a man of many diverse interests. He had a lifelong passion for poetry and classical languages. He could read and translate works in French, German, Italian, Latin, and Greek. He often included quotes from classical poetry in his mathematical papers. He even wrote a book called "The Laws of Verse" to study prosody. In 1876, he returned to the United States to join Johns Hopkins University. He was the inaugural professor of mathematics there. He earned a salary of $5,000, though he initially requested it in gold.

At Johns Hopkins, Sylvester acted as a mentor and advocate. He helped Christine Ladd-Franklin become a student at the university. The university board initially tried to revoke her fellowship because she was a woman. Sylvester insisted that she remain, and she held a fellowship for three years. His leadership helped shape the American mathematical landscape. In 1880, the Royal Society of London awarded him the Copley Medal. This was their highest honor for scientific achievement. He died in London on March 15, 1897, leaving a massive scientific legacy.

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