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Language Learning › Learn Latin › Latin Grammar ›

Latin Numbers

Cardinal Numbers (How Many?) 1–20 with Notes # Latin Abbreviation Declines? 1 ūnus, ūna, ūnum I Yes (pronominal: gen. -īus, dat. -ī) 2 duo, duae, duo II Yes (see below) 3 trēs, tria III Yes (3rd decl. i-stem adj.) 4 quattuor IV (IIII) No 5 quīnque V No 6 sex VI No 7 septem VII No 8 octō VIII No 9 novem IX (VIIII) No 10 decem X No 11...

Maths › 03. Logic and Foundations ›

7.4 Arithmetic of Cardinals

Cardinal arithmetic studies how the sizes of sets behave under natural set theoretic operations. Addition corresponds to disjoint union, multiplication corresponds to Cartesian product, and exponentiation corresponds to sets of functions. For finite sets these operations agree with ordinary arithmetic, but for infinite sets they have behavior that is at first surprising and later becomes one of the central tools of set theory. Cardinal Numbers A cardinal number is a...