A conversational lounge sharing ideas about mathematics and its history.

Friday, January 4, 2008

Cardinal v Ordinal



No, it's not a baseball rivalry. It's a rivalry of ideas. The cardinal sense of a number addresses the question of "How many?" As in "Three strikes and you're out." The ordinal sense of a number addresses the question of "What order?" As in "You're batting clean-up," that is, being fourth in the batting order. Which sense of number do you think came first? Batter-up!

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