Cardinal and ordinal numbers Waclaw Sierpinski
Publisher: PWN, Warsaw

The "natural number" is a concept that fulfills two needs : that of ordering, and that of comparing sets "in power", i.e. For the first need, one defines the ordinal numbers, for the second the cardinal numbers. Quoted from: Pi in the Sky, by John Barrow. A different form of “infinity” are the ordinal and cardinal infinities of set theory. I remember cardinal numbers as non-negative integers; 0, 1, 2, 3, and so on. I just checked Wikipedia and found that my understanding of them is … childlike. Some adjustments are made based on phonetics. Is Valentine's Day on February 14th, or February 14? I remember ordinal numbers as first, second, third, and so on. Spanish speakers use ordinal numbers — those used to express numbers in a series — far less frequently than cardinal numbers , but ordinals still have some. The ordinal numbers are formed by adding -th to the root of the cardinal number, except for numbers ending in 1, 2 and 3 which have special forms. Did the runner come in 1, or did he come in 1st in the race? Perbedaan Cardinal dan Ordinal Number - Blog Pendidikan Untuk Guru dan Siswa.