Who were John Venns peers or any mathematicians working on the same thing as John during the same time as him?

John Venn, a British mathematician, was known for his work in diagrammatic representation and the development of Venn diagrams. He lived from 1834 to 1923, primarily working in the late 19th and early 20th centuries.

During his time, there were several other mathematicians who were working on similar topics or had overlapping interests. Some of his contemporaries included:

1. Lewis Carroll (1832-1898): Lewis Carroll, renowned for his literary works like "Alice's Adventures in Wonderland," also made significant contributions to mathematics. He worked on logic and symbolic logic, which intersected with Venn's work on diagrams and logic.

2. Augustus De Morgan (1806-1871): De Morgan, a British mathematician and logician, was known for his work in the field of logic, including the study of logical operations and quantifiers. His work on sets and symbolic logic overlaps with Venn's work.

3. Charles Sanders Peirce (1839-1914): Peirce, an American mathematician, philosopher, and logician, made important contributions to logic and the foundations of set theory. His work on logic and set theory has connections to Venn's contributions.

4. Gottlob Frege (1848-1925): Frege, a German mathematician and logician, was one of the pioneers of modern formal logic. His work on predicate logic and logical calculus was influential and had connections to Venn's work on diagrams.

These mathematicians, along with others of their time, explored various aspects of logic, set theory, and symbolic representations, which align with Venn's work and interests.