Ideas of R Kaplan / E Kaplan, by Theme
[American, fl. 2003, Husband and wife who have both taught mathematics at Harvard University.]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / j. Axiom of Choice IX
15717

Using Choice, you can cut up a small ball and make an enormous one from the pieces

6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / b. Types of number
15712

1 and 0, then add for naturals, subtract for negatives, divide for rationals, take roots for irrationals

6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / g. Real numbers
15711

The rationals are everywhere  the irrationals are everywhere else

6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / f. Arithmetic
15714

'Commutative' laws say order makes no difference; 'associative' laws say groupings make no difference

15715

'Distributive' laws say if you add then multiply, or multiply then add, you get the same result

14. Science / C. Induction / 3. Limits of Induction
15713

The first million numbers confirm that no number is greater than a million
