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15
Math.TechQA.Club
2026-04-10 01:07:45
87
Views
a question about integers and sine function
Published on
10 Apr 2026 - 1:07
#proof-writing
#puzzle
187
Views
Exotic schemes of implications, examples
Published on
09 Apr 2026 - 0:04
#logic
#proof-writing
#proof-theory
#meta-math
81
Views
A Proof in Combinatorics
Published on
10 Apr 2026 - 8:38
#combinatorics
#proof-verification
#proof-writing
#proof-explanation
147
Views
Let A be a square complex matrix. Show that I-A^(m+1) = (I-A)(I+A+...+A^m).
Published on
25 Mar 2026 - 12:49
#linear-algebra
#complex-numbers
#proof-writing
40
Views
Confirmation of Proof: $\forall\{x,y,z\}\subset\mathbb{Z}, \ x^2 + 2y^2 = 3z^2 \Leftrightarrow 3\mid x\land y$
Published on
25 Mar 2026 - 7:21
#proof-verification
#proof-writing
#proof-explanation
231
Views
Trigonometry problem, Evaluate: $\frac {1}{\sin 18°}$
Published on
24 Mar 2026 - 23:42
#algebra-precalculus
#trigonometry
#proof-verification
#proof-writing
#radicals
201
Views
Proving the area of the circle using sticks.
Published on
01 Apr 2026 - 18:45
#proof-verification
#proof-writing
#circles
390
Views
Prove that an even order ($n=2k$) graph without cycle of order 3, has a size $m \le k^2$
Published on
08 Apr 2026 - 23:12
#graph-theory
#proof-writing
#induction
#bipartite-graphs
38
Views
Method of Proof
Published on
05 Apr 2026 - 3:01
#proof-writing
188
Views
Is $\frac{5\pi}{6}$ a transcendental or an algebraic number?
Published on
08 Apr 2026 - 21:41
#proof-writing
#algebraic-number-theory
#pi
#transcendental-numbers
#golden-ratio
252
Views
What is the identity element for the subgroup $H=\{a+b\sqrt{2}:a,b\in\mathbb{Q},\text{$a$ and $b$ are not both zero}\}$ of the group $\mathbb{R}^*$?
Published on
08 Apr 2026 - 21:10
#group-theory
#proof-writing
#rational-numbers
197
Views
Prove that if $G$ is a group with $(ab)^{2}=a^{2}b^{2}$ for all $a,b\in G$, then $G$ is abelian.
Published on
25 Mar 2026 - 1:18
#group-theory
#proof-writing
#abelian-groups
1k
Views
Abstract Algebra: G is Abelian, $H:= \{x \in G : \lvert x\rvert \text{ is odd} \}$ Prove that $H$ is a subgroup of $G$
Published on
29 Jan 2018 - 16:04
#abstract-algebra
#proof-writing
72
Views
Prove the following statements without using induction
Published on
31 Mar 2026 - 18:43
#calculus
#complex-analysis
#trigonometry
#proof-writing
379
Views
Different ways to prove a set is a subspace of $\mathbb R^n$
Published on
25 Mar 2026 - 16:01
#linear-algebra
#vector-spaces
#proof-writing
#systems-of-equations
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