Discrete math
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10 Terms
1
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even
if n-2k where k{z
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odd
if n-2k+1 where k{z
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prime
if only positive divisors are 1 and n itself
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composite
n=ab and 1<a and 1<b
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perfect square
(a + b)² = a² + 2ab + b²
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rational numbers
x= a/b where a,b{z and b≠0
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divides
b|a —> a=bk,k{z
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Contrapositive
If p, then q" is "If not q, then not p."
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contradiction
If not p and not q are both true, then p and q cannot both be true.
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q-r therom
a = dq + r 0 < r < d