He used "aleph", the first letter of the Hebrew alphabet, which looks like this: ×
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Many mathematicians have worked on the mathematics of infinity. Leibniz, Frege, Dedekind, Cantor, Hilbert are some.
georg cantor
· Cantor was the first mathematician to put a firm logical foundation for the term "infinity," and described a way to do arithmetic with infinite quantities useful to mathematics. He stated that a collection is infinite, if some of its parts are as big as the whole. Cantor also was able to demonstrate that there are different sizes of infinity. · Cantor revolutionized the foundation of mathematics with set theory. o One to One Correspondence: He showed that you could make a one-to-one correspondence between the natural numbers § (1, 2, 3, 4, ... } and the integers (..., -3, -2, -1, 0, 1, 2, 3 ...} o Continuum Hypothesis: The cardinality of the set of all subsets of any set is strictly greater than the cardinality of the set o For any set A, cardinality(powerset(A))>carinality(A) · Transfinite numbers o Used to count the number of integers and the number of real numbers
George Cantor.
Richard Dedekind and Georg Cantor.