Mathematics

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earned this badge 12 times.
How do I determine if a set is open or closed??
Awarded Mar 26, 2021 at 7:34
Proof: The identity matrix is invertible and the inverse of the identity is the identity
Awarded Sep 1, 2020 at 21:45
Chain rule with triple composition
Awarded Mar 26, 2019 at 21:21
The coefficient of $x^9$ in the expansion of $(1+x)(1+x^2)(1+x^3)\cdots(1+x^{100})?$
Awarded Aug 7, 2016 at 1:26
Easy math proofs or visual examples to make high school students enthusiastic about math
Awarded Jun 25, 2015 at 11:12
Doubt about the domain in logarithmic functions.
Awarded May 27, 2015 at 1:01
What's wrong with l'Hopital's rule?
Awarded May 18, 2015 at 11:01
What to answer when people ask what I do in mathematics
Awarded May 6, 2015 at 17:54
Why/How does this sqrt term work? The inverse of a fraction in a sqrt
Awarded Mar 25, 2015 at 17:48
Why is $-5^2=-25$?
Awarded Mar 10, 2015 at 20:58
Why is the cube-root of $x$ 'odd'?
Awarded Oct 23, 2014 at 1:35
What is an example of function $f: \Bbb{N} \to \Bbb{Z}$ that is a bijection?
Awarded Oct 10, 2014 at 6:57

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