The Cardinal directions are: North, East, South, and West
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7 is cardinal. '7th' is the ordinal form of 7.
Georg Cantor (note the spelling) was a Russian-born German mathematician who lived from 1845 to 1918. He is remembered for a great many innovations, including the definition of cardinal and ordinal numbers and the creation of set theory.
Fourteen is a cardinal number. Its equivalent ordinal number is fourteenth. Its equivalent Roman numeral is XIV.
Normally ordinal numbers refer to positive positions. Cardinal numbers are negative, zero or positive.