OlayinkaSF

2,449 reputation

1630

bio	website
	location	Marrakesh, Morocco
	age	21
visits	member for	1 year, 1 month
	seen	23 hours ago
stats	profile views	479

How does one plan amidst savages?

	2,449 reputation	bio	website		visits	member for	1 year, 1 month
1630 badges		location	Marrakesh, Morocco		seen	23 hours ago

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20 Favorites

added views newest activity votes

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answer

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How to find length of a rectangular tile when viewing at some angle [duplicate]

geometry

may 9 at 9:41 MvG 2,999

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answer

563

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Proving that $x$ is an integer, if the differences between any two of $x^{1919}$, $x^{1960}$, and $x^{2100}$ are integers

apr 19 at 18:40 mercio 12.1k

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answer

146

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Help with the inequality $\sum_{k=1}^{1006} \sqrt{k \cdot (2014-k)}<506^2\pi$

homework inequality

feb 23 at 21:18 enzotib 2,254

votes

answer

551

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find $\angle{DAC}$

geometry

dec 20 at 12:30 Community♦ 1

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100

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Islands game and graph theory

reference-request graph-theory

dec 26 at 11:09 A.Schulz 2,010

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kviews

What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into?

geometry puzzle recreational-mathematics open-problem tiling

mar 25 at 15:26 Ed Pegg 2,150

votes

answers

349

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Inequality for cosines

geometry trigonometry inequality

jul 28 at 23:29 Zander 5,061

votes

answers

807

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Challenging inequality: $abcde=1$, show that $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+\frac{1}{d}+\frac{1}{e}+\frac{33}{2(a+b+c+d+e)}\ge{\frac{{83}}{10}}$

algebra-precalculus inequality

dec 21 '11 at 8:13 user782220 735

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answers

529

views

Two theorems about an inscribed quadrilateral and the radius of the circle containing its vertices

geometry

jan 26 '12 at 18:00 Brian M. Scott 162k

votes

answers

kviews

How to prove Euler's formula: $e^{it}=\cos t +i\sin t$?

complex-analysis complex-numbers

apr 21 at 13:54 Julián Aguirre 15k

votes

answers

131

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How would you solve this recurrence equation: $a_{n+1}-2a_{n}=6\cdot 5^n$ for $n\geq 1$

discrete-mathematics

nov 24 at 9:26 robjohn♦ 63.3k

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answers

617

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How to solve this recurrence relation? $f_n = 3f_{n-1} + 12(-1)^n$

linear-algebra recurrence-relations recursive-algorithms

oct 2 at 20:50 Max 250

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answer

views

Why is $\operatorname{Var}(X+Y) = \operatorname{Cov}(X,X) + \operatorname{Cov}(X,Y) + \operatorname{Cov}(Y,X) + \operatorname{Cov}(Y,Y)$

probability statistics

nov 18 at 9:00 Stefan Hansen 9,518

votes

answer

193

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Sieve of Atkin - algorithm for enumerating lattice points.

linear-algebra number-theory algorithms

nov 17 at 19:01 Community♦ 1

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kviews

A question on Taylor Series and polynomial

calculus real-analysis sequences-and-series

dec 13 at 16:20 Mark Hurd 372

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kviews

How to prove those “curious identities”?

trigonometry

oct 6 '11 at 4:06 robjohn♦ 63.3k

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answers

kviews

In a family with two children, what are the chances, if one of the children is a girl, that both children are girls?

probability faq

may 6 at 23:01 Judie 1

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answer

140

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Inequality $\frac{x^3+1}{\sqrt{x^4+y+z}}+\frac{y^3+1}{\sqrt{y^4+z+x}}+\frac{z^3+1}{\sqrt{z^4+x+y}}\geq 2\sqrt{3}$

inequality

feb 25 at 16:32 Ivan Loh 8,108

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answer

kviews

Are there infinitely many “super-palindromes”?

recreational-mathematics

nov 17 at 15:30 Victor Engel 41

146

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answer

kviews

How many fours are needed to represent numbers up to $N$?

combinatorics elementary-number-theory discrete-mathematics asymptotics puzzle

feb 26 at 4:43 JoshuaZ 71