Mathematics
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All Questions Answers
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question
3
Proof that $A \times C\subseteq B \times C \iff A \subseteq B$
Sep 18, 2021
question
3
"Let m $\in N$ s.t $m = 2s$, where s is an odd integer. Prove that there do not exist positive integers x and y such that $x^{2} − y^{2} = m$."
Sep 20, 2021
question
2
Orthogonal trajectories problem results in multiple answers.
Aug 16, 2021
question
2
Prove, for every nonnegative integer $n$, that $5^{2n} + 2^{2n} ≡ 2^{2n+1}\pmod{21}$.
Nov 14, 2021
question
1
Proof by Induction(Verification)
Oct 2, 2021
question
1
Let $a, b, c ∈ Z$. Then $ab + ac + bc$ is even if and only if at most one of $a, b$ and $c$ is odd.
Nov 14, 2021
question
1
How do I find solutions for this kind of problems?
Nov 15, 2021
question
0
How would someone find a proof for this?
Nov 6, 2021
question
0
Prove for every three integers $a$, $b$ and $c$ that an even number of the integers $a + b$, $a + c $and $b + c$ are odd. [duplicate]
Nov 13, 2021
question
0
Rudins introduction, no largest element in {$p \in \mathbb{Q} | p^2<2$}
Apr 11, 2022
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How long would it take someone to master the topics in the book "Book of Proof" by Hammack and similar?

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