Charles Ehresmann

Charles Ehresmann was a French mathematician known for his contributions to topology and differential geometry. He developed the concept of categories and used them to understand the structures of mathematical objects and their relationships. His work in the 20th century focused on fiber bundles, which describe how spaces can be "layered" over each other, helping to bridge the gap between abstract mathematics and practical applications in physics, particularly in understanding the properties of space and shape. Ehresmann's ideas are foundational in modern mathematics, influencing areas like algebraic topology and differential geometry.