Questions tagged [solution-verification]

For posts looking for feedback or verification of a proposed solution. "Is my proof correct?" is too broad or missing context. Instead, the question must identify precisely which step in the proof is in doubt, and why so. This should not be the only tag for a question, and should not be used to circumvent site policies regarding duplicate questions.

This tag should be used when you have a proposed solution to a problem and have specific concerns or doubts about the validity of that solution. A question with this tag should include an explanation for why the argument presented is not convincing enough. Further discussion on using this tag can be found in the Mathematics Meta questions (1) and (2).

Answers to questions tagged look first and foremost to check that the solution is right, and to comment upon the approach taken by the author of the question. If the proposed solution is wrong, a good answer would explain where or how mistakes were made, and possibly give or sketch a correct solution instead.

If the proposed solution is correct, an answer would ideally provide further evidence to back the answerer's opinion. These could include a clearer rewriting of the given argument, alternative arguments, generalizations of the proven result, or careful consideration of unexpected subtle points. Users looking to write answers can find further discussion in this Mathematics Meta post.

21426 questions
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$\forall n \in Z, \exists y \in R -{0}$ such that $y^n \leq y$

For this question: $$\forall n \in Z, \exists y \in R -{0}$$ such that $$y^n \leq y$$ Why is the following explanation wrong? $$y^n\leq y=nln(y)\leq ln(y)= n \leq 1$$ Hence the statement is false
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Is this proof mathematically correct?

Is the following proof technically correct? I am aware that it might not seem typical, but me and my math teacher did not find why it isn't correct. In a triangle ABC, given AB=AC, prove ∠B=∠C. (This is not a textbook problem, I created it out of…
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I want to prove that for all normal number (M ) Takes place of GCD(m!+1,(m+1)!+1)=1 is true

I want to prove that for all normal number (M ) Takes place of (m!+1,(m+1)!+1)=1 is true
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Prove that f∈Θ(g)if and only ifO(f) =O(g).

I know that big O is used to describe the upper bound of a function, so doesn't this mean that if the upper bounds f and g are the same, they are the same function? If this is the case, then we can say that f ∈ Θ(g) because if that were not the…
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Why is $\frac{ab}{c}=\frac{a}{c}b$

Simple question. Why is the following true? $$\frac{ab}{c}=\frac{a}{c}b$$
Johannes
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how do we know if a beizer curve generated by 3 points is not part of hyperbola?

sure the path traced by the two points look parabolic in shape but isn't that foolish to just assume it is parabolic with out actual proof? i am hoping if some one can give me a decent explanation of why that path is parabola but not part of…
Robel
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What is true about the three statements?

$C \ = \ \frac{5}{9}(F-32)$ The equation above shows how temperature F, measured in degrees Fahrenheit, relates to a temperature C, measured in degrees Celsius. Based on the equation, which of the following must be true? I. A temperature increase of…
Stevo
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How do we show that $a=\sqrt{4k-1}, k\in\mathbb Z$ and $a\in\mathbb Z$

I tried to prove the following question using contrapositive proof: "Prove that if $a\in\mathbb Z$, then not $4\mid(a^2+1)$" And I got to a $a=\sqrt{4k-1}, k\in\mathbb Z$ My question is: How do we show that $a=\sqrt{4k-1}, k\in\mathbb Z$ and…
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What are the possible combinations from 111 to 999 if we remove the combinations that contain zero?

I tried finding it like this 111 to 119 is 9 so 111 to 199 is 89 and 211 to 299 is 89 and so on. Then i multiplied 89 with 9 and got 801. Is this correct?
E Cube
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Proof of polynomial equation

I'd like to prove that $a^n + b^n = c^n$ where $n>2$ and $a>0$, $b>0$, and $c>0$ has no solution. I first divided each by $a$, then I get $c>a$. Then, I divided each by $b$, then I get $c>b$. Finally, I divide each by $c$, then I get $(a/c)^n +…
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Euler's Identity

Can anyone explain where did I actually commit a mistake? In the end I got the result that e^(2\pi )=1 (which is clearly not true)
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