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New posts in alternative-proof
Different ways to evaluate $\sum_{n=1}^\infty\frac{H_nH_n^{(2)}}{(n+1)(n+2)(n+3)}$
integration
sequences-and-series
alternative-proof
harmonic-numbers
polylogarithm
How to simply prove that a certain graph is a subdivision of $K_{3,3}$
graph-theory
alternative-proof
Why isn't Axiom of Choice a trivial result? Is it needed to prove existence of this recursive function?
elementary-set-theory
axiom-of-choice
alternative-proof
New, elegant proofs for $\varphi(p^{k})=p^{k}-p^{k-1}$
number-theory
elementary-set-theory
alternative-proof
totient-function
Prove that the symmetric group $S_n$, $n \geq 3$, has trivial center. [duplicate]
abstract-algebra
group-theory
proof-verification
symmetric-groups
alternative-proof
Integral $\int_0^1 \frac{\ln(1-x)\ln(1+x^2)}{x}dx$
integration
definite-integrals
alternative-proof
Better proof for $\frac{1+\cos x + \sin x}{1 - \cos x + \sin x} \equiv \frac{1+\cos x}{\sin x}$
trigonometry
alternative-proof
Show that $e^n>\frac{(n+1)^n}{n!}$ without using induction.
inequality
proof-writing
exponential-function
alternative-proof
"Proof" that $\mathbb{R}^J$ is not normal when $J$ is uncountable
general-topology
alternative-proof
Show that $[2x]+[2y] \geq [x]+[y]+[x+y]$
elementary-number-theory
proof-verification
proof-writing
solution-verification
alternative-proof
Is an isometry necessarily surjective?
proof-verification
metric-spaces
alternative-proof
isometry
Why does a convex polyhedron being vertex-, edge-, and face-transitive imply that it is a Platonic solid?
geometry
alternative-proof
symmetry
polyhedra
platonic-solids
If $g:[0,1] \to \Bbb{R}$ such that $g(x)=g(y) \implies g'(x)=g'(y)$ for all $x,y \in (0,1)$, then $g$ is monotonic?
real-analysis
alternative-proof
monotone-functions
Is it possible to prove $g^{|G|}=e$ in all finite groups without talking about cosets? [duplicate]
abstract-algebra
group-theory
alternative-proof
Intuitive/direct proof that a rectangle partitioned into rectangles each with at least one integer side must itself have an integer side
geometry
alternative-proof
integers
rectangles
tiling
$p,q,r$ primes, $\sqrt{p}+\sqrt{q}+\sqrt{r}$ is irrational.
number-theory
proof-verification
alternative-proof
radicals
rationality-testing
An attempt to prove the generalization of $\sum_{n=1}^\infty \frac{(-1)^nH_n}{n^{2a}}$
integration
sequences-and-series
alternative-proof
harmonic-numbers
euler-sums
Elementary proof that there is no field with 6 elements
abstract-algebra
field-theory
finite-fields
alternative-proof
Can one prove that there is only one proof?
logic
alternative-proof
proof-theory
Checking that a $3$-D diagram is commutative
commutative-algebra
proof-writing
alternative-proof
exact-sequence
article-writing
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