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15 votes
Accepted

Something's not right about my understanding about identity matrices.

10 votes

Maximize Area of A Rectangle.

9 votes

Why do we care about planar graphs?

9 votes
Accepted

Why did the author write "Why?"? Any deep reason? ("Calculus Fourth Edition" by Michael Spivak)

9 votes
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Art historian trying to identify math diagrams in a painting

8 votes
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Why does “propositional calculus” have the word “calculus” in it?

7 votes

What does $a \ne b \ne c$ mean?

7 votes

Suppose that $g$ is an even function and let $h=f \circ g$. Is $h$ always an even function?

7 votes

Is there a question that contains no numbers except $1$, whose answer is $\pi/7$?

6 votes

Why does it seem like that a tangent line of an odd-degree polynomial function crosses the curve at more than one point?

6 votes
Accepted

High School Combinatorics - I do not agree with the provided explanation

6 votes
Accepted

Tautologies in classical logic

6 votes
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What was Newton's proof of the Product Rule and why was it "not satisfactory"?

5 votes

Reviewing a 2016 IITJEE problem

5 votes
Accepted

What is the maximum value of the product of the length of a side and the opposite the angle of a triangle?

5 votes

Number of triangles a point lies in on a plane

5 votes

Evaluating $\lim_{x \to \infty} \sqrt{x^2 + 2x} - x$. Why doesn't $x^2$ overpower $2x$ when $x\to\infty$, so that the answer is $0$ (instead of $1$)?

5 votes
Accepted

Can implication be false despite its left and right operands being true?

4 votes
Accepted

Show $\sqrt 2 + \sqrt[n]{n}$ is irrational

4 votes
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Word problem: triple of reals preserved by percentage-wise decrements

4 votes

How to approach a mathematical proof about the uniqueness of solution of a diophantine equation

4 votes
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For what $k$ does $\sin(x)$ hit $kx$ 9 times

4 votes
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Math term for the distance between the center and a chord of a circle

4 votes
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Is there a standard function that has this kind of precision-behavior?

4 votes
Accepted

In set theory, is the axiom of pairing circular?

4 votes
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The Way to Combine Many Inequalities

4 votes

How to get angles of a triangle given three slopes from each line

4 votes
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Why does Desmos not plot $ \sqrt{\frac{(x+y)^2}{2}} = \sqrt{x^2+y^2} + \sqrt{2} $?

4 votes
Accepted

Where's my misstep in this trigonometric problem?

4 votes

What's happening — mathematically — in this bandsaw technique?

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