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calculatormathematical
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12 votes
4 answers
356 views

Determinant of a Pascal Matrix, sort of

11 votes
3 answers
477 views

Two vertices of a triangle being fixed, find the locus of the third vertex such that the triangle has its circumcenter inside the incircle

7 votes
2 answers
122 views

Convergence of sum with binomial coefficient

6 votes
4 answers
329 views

Volume of a solid created by an extended tetrahedron

5 votes
3 answers
121 views

Is $8$ the only number with four divisors, the second largest of which is even?

5 votes
2 answers
936 views

Rhombus in a cyclic quadrilateral

5 votes
1 answer
274 views

Additive but not $\sigma$-additive measure $\mathbb{Q} \cap I$

5 votes
3 answers
118 views

Algebraic calculation with polynomial and complex root.

5 votes
1 answer
327 views

Romanian Math Competition (2007): Group Cardinality Inequality $|G| \geq 1+\prod_{i=1}^n\left(p_i^2-1\right)$

5 votes
2 answers
197 views

Digit sum equality $S(a^n + n) = 1 + S(n)$ implies that $a$ is a power of ten

4 votes
1 answer
108 views

Proving that Coefficients of Homogeneous Linear Differential Equations have to be constant if $f^{\prime}$ and $f$ are solutions

4 votes
2 answers
139 views

Limit of distribution function of Poisson distributed random variables

4 votes
2 answers
570 views

Bilinear Form and Rank Proof

4 votes
0 answers
93 views

Proof that this is a Norm

3 votes
2 answers
540 views

Lemma by Riemann-Lebesgue

3 votes
1 answer
44 views

Fubini and induction for a sum over a set $Q$

3 votes
6 answers
489 views

Inequality, finding Constant

3 votes
3 answers
393 views

Heptadecagon Derivation

3 votes
6 answers
132 views

Inequality $xy+yz+zx-xyz \leq \frac{9}{4}.$

3 votes
1 answer
59 views

Projective Basis Explanation, Visualisation

3 votes
1 answer
146 views

Finding the roots of a polynomial to get expression for real part of a unit root of the heptadecagon

3 votes
1 answer
109 views

Deriving a CRT formula for noncoprime moduli

3 votes
1 answer
101 views

Euler's Totient Function - Multiplicativity via Group of Units

3 votes
0 answers
109 views

Adjoint differential equations - Relation

3 votes
1 answer
78 views

Digit Product Inequality

2 votes
1 answer
64 views

Surjective morphism; if $U$ contains Kernel then $[G: U]=[H: \varphi[U]]$

2 votes
1 answer
45 views

Proof that the set $ \tilde{D}=\{ (x, y) \in V \times V \mid[x, y] \subseteq D \}$ is open in $V \times V$

2 votes
3 answers
60 views

Trigonometric integral inequality

2 votes
4 answers
91 views

Pythagorean Triples - $c$ divisible by $7$

2 votes
4 answers
124 views

Showing $\sum_{cyc} \frac{\cos(\frac{\alpha+\beta}{2})}{\cos \frac{\alpha}{2}\cos \frac{\beta}{2}}=2$ when $\alpha+\beta+\gamma=\pi$

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