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Mathematics
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Marc's user avatar
Marc
  • Member for 6 years, 8 months
  • Last seen more than a month ago
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10
Combinatorial proof of $\binom{nk}{2}=k\binom{n}{2}+n^2\binom{k}{2}$
Mar 30, 2019
5
How to prove an implication within an if and only if
Mar 8, 2018
4
Proving that $a_n=\sqrt{n^2+n}-n$ converges, finding its limit and showing that its sequence ${(a_n)^{\infty}_{n=1}}$ is monotinic.
Nov 29, 2017
4
Proving whether the series $\sum_{n=1}^\infty \frac{(-1)^n}{n-(-1)^n}$ converges.
Dec 21, 2017
3
Factoring $X^5 - X^4 - X^3 + X^2 + X$ into irreducible factors: Is my solution correct?
Oct 24, 2020
3
Combinatorics - Choosing sticks
Oct 23, 2020
3
Statistical Odds calculation for a video game occurrence
Oct 23, 2020
3
Proving $T^2=T_0 \iff R(T)\subset N(T)$
Dec 2, 2017
3
Proving that there is no total ordering of $\mathbb{C}$ such that it is an ordered field
Dec 5, 2017
3
How many distinct 20-bead necklaces can be made with beads of 3 different colors?
Mar 29, 2019