List questions from education

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Different ways to come up with $1+2+3+\cdots +n=\frac{n(n+1)}{2}$

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Can I write a pdf with exercises taken from other sources, solving them myself and not cite them, or do I have to ask for permission?

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What are some good mathematical magazines and journals for undergraduates and/or high school students?

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Aspiring Engineer Math Book

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Ask about beautiful properties of $e$

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if A then B & if not A then C

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using math to solve foreign language phrases

Published on 25 Jan 2017 - 21:52

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How to solve this proportion

Published on 26 Jan 2017 - 1:00

355

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Infinity times zero

Published on 27 Jan 2017 - 8:19

801

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How can a Fields Medallist be 'not very good at logic'?

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196

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integration in 2D over delta function with 2 variables

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When I was solving an equation with floor function in my class

Published on 30 Mar 2026 - 11:33

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Why isn't $2^{2^{-1}}$ equivalent to $2^{-2}$?

Published on 27 Jan 2017 - 21:40

856

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What restrictions on decimal expansions lead to countably infinite subsets of the reals?

Published on 30 Mar 2026 - 7:41

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Scaling down circles

Different ways to come up with $1+2+3+\cdots +n=\frac{n(n+1)}{2}$

Can I write a pdf with exercises taken from other sources, solving them myself and not cite them, or do I have to ask for permission?

What are some good mathematical magazines and journals for undergraduates and/or high school students?

Aspiring Engineer Math Book

Ask about beautiful properties of $e$

if A then B & if not A then C

using math to solve foreign language phrases

How to solve this proportion

Infinity times zero

How can a Fields Medallist be 'not very good at logic'?

integration in 2D over delta function with 2 variables

When I was solving an equation with floor function in my class

Why isn't $2^{2^{-1}}$ equivalent to $2^{-2}$?

What restrictions on decimal expansions lead to countably infinite subsets of the reals?

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