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Intereting Posts

Does dividing by zero ever make sense?
How to simplify $\sum_{a_1=1}^n\sum_{a_2=1}^{a_1}\sum_{a_3=1}^{a_2}\dots\sum_{a_{k+1}=1}^{a_k}1$
Can mathematical inductions work for other sets?
How to calculate the area of a region with a closed plane curve boundary?
Intuition Behind, or Canonical Examples of Finite Type Morphisms
Two homologous but not homotopic loops on a closed surface of genus greater than one
Elliptic partial differential equations and elliptic operators
Math olympiad 1988 problem 6: canonical solution (2) without Vieta jumping
Is the Galois group associated to a random polynomial solvable with probability 0?
Why is Hodge more difficult than Tate?
Proving Undecidability of first order logic without first proving it for arithmetic.
In most geometry courses, we learn that there's no such thing as “SSA Congruence”.
Prove $\gcd(a+b,a^2+b^2)$ is $1$ or $2$ if $\gcd(a,b) = 1$
If a topology contains all infinite subsets, then it is the discrete topology
Parametrization for intersection of sphere and plane