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$R$ is transitive if and only if $ R \circ R \subseteq R$

elementary-set-theory relations equivalence-relations function-and-relation-composition asked Mar 13, 2014 at 23:41

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Which rational primes less than 50 are also Gaussian primes?

elementary-number-theory asked Nov 23, 2014 at 9:16

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Determining which pairs of quantified statements are equivalent

homework logic predicate-logic asked Jan 30, 2014 at 3:50

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Prove that the inequality $(1+ \frac{1}{n})^n < n$ holds for all $n \geq 3$

homework induction asked Feb 9, 2014 at 9:35

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Prove or disprove $(A + B) \cap C = (A \cap C) +(B \cap C)$

elementary-set-theory proof-verification asked Mar 3, 2014 at 8:27

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Proving isomorphisms from posets.

homework relations asked Mar 15, 2014 at 11:35

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Let $a,b \in R$ where $ a < b$. Prove that there exist a rational number $c$ and an irrational number $d$ such that $ a <c<b$ and $ a<d<b$.

homework proof-writing irrational-numbers rational-numbers asked Apr 24, 2014 at 8:53

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How to write "I'm going to sleep tomorrow"?

grammar particles english-to-japanese asked Oct 2, 2014 at 8:08

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Arithmetic Functions: Evaluate $ \sigma(210)$ and $d(63)$

elementary-number-theory asked Oct 21, 2014 at 1:21

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Top Answers

How do I solve $y''+4y=0$?

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