Georg Cantor (German mathematician)

Georg Cantor was a German mathematician who revolutionized our understanding of infinity. He introduced the concept that infinities can have different sizes; for example, some infinite sets, like the natural numbers (1, 2, 3, ...), are countably infinite, while others, like real numbers between 0 and 1, are uncountably infinite, meaning they are a "larger" type of infinity. His work laid the foundation for modern set theory and changed how mathematicians think about the concept of infinity, demonstrating that it is both a surprisingly rich and nuanced idea.