# March 3, 1845, Georg Cantor, nationalized mathematician, inventor of set theory, was born.

On this day (March 3) in 1845, Georg Cantor, a nationalized mathematician, inventor of set theory, was born.
Georg Cantor was the inventor with Dedekind (1831) of set theory, which is the basis of modern mathematics.
Set theory is a branch of mathematical logic that studies the properties and relationships of sets: abstract collections of objects, considered as objects in themselves. Sets and their most elementary operations are a basic tool in the formulation of any mathematical theory.
Before George Cantor, no one had fully understood the concept of infinity. It was a tricky subject that didn't seem to be getting anywhere. But Cantor showed that the notion of infinity was perfectly understandable. In fact there was not just one infinity, but many infinities.
For example. Cantor picked one set of numbers {1, 2, 3, 4,....} and then picked another set of numbers {10, 20, 30, 40,...}. He showed that these two sets of infinite numbers have the same size because we can match it up, 1 with 10, 2 with 20, ... and so on so both infinities were the same size.
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Thanks to his daring investigations on infinite sets he was the first able to formalize the notion of infinity in the form of transfinite numbers (cardinal and ordinal). >
A famous phrase of Georg Cantor was;
“In mathematics, the art of proposing a question must have greater value than solving it.”
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- thanks to set theories...
- sets?
- we study the properties and...
- but what sets?
- relations of the sets...
- but what sets are you talking about?
- ...how?
- what set are you talking about?
- oh, the mathematical sets
- wow, what a scare
- what a scare?
- I thought he was hitting on me
- throwing the yews?
-- yes, you wanted to do outfits with me