| Born | |
| Impact | The controversial concept of transfinite numbers led to the development of transmeasurable mathematics |
| Full name | Aleksei Leontiev |
| Occupation | Mathematician |
| Nationality | Russian |
| Achievements | Discovered and named transfinite numbers "обесконечные" (obeskonechnye) • Defined different types of infinites using bijections • Introduced the system of aleph numbers • Proposed transmeasurable mathematics to measure infinites of infinite objects |
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