user7530

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216 Answers

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62	Construct a function which is continuous in $[1,5]$ but not differentiable at $2, 3, 4$
18	What does matrix multiplication actually mean?
14	How to solve equation $ \dfrac{1}{2} (\sqrt{x^2-16} + \sqrt{x^2-9}) = 1$?
12	Prove that $\sum\limits_{k=1}^n \frac{1}{k^2+3k+1}$ is bounded above by $\frac{13}{20}$
12	Can there be two distinct, continuous functions that are equal at all rationals?

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8,218 Reputation

+20	Construct a function which is continuous in $[1,5]$ but not differentiable at $2, 3, 4$
+25	Singular Value Decomposition of a block diagonal matrix
+45	Is there a pattern in figures whose perimeter is the same as their area?
+5	Elementary proof that $\mathbb{R}^n$ is not homeomorphic to $\mathbb{R}^m$

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22 Questions

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30	Elementary proof that $\mathbb{R}^n$ is not homeomorphic to $\mathbb{R}^m$
19	recurrence relation arising from Magic the Gathering scenario [duplicate]
10	Integral around unit sphere of inner product
7	closed-form expression for roots of a polynomial
6	How do I compute $a^b\,\bmod c$ by hand?

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123 Tags

121 calculus × 33	41 geometry × 21
107 linear-algebra × 46	31 elementary-number-theory × 13
100 homework × 20	22 multivariable-calculus × 17
77 matrices × 24	22 real-analysis × 13
60 algebra-precalculus × 14	19 number-theory × 7

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$Mathematics Stack Exchange$	Mathematics	8,218 rep	11338
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	Physics	208 rep	14
	Meta Stack Overflow	160 rep	6
	Academia	156 rep	1

38 Badges

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homework	linear-algebra
Caucus	Electorate
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Yearling × 2	Nice Answer × 8
Disciplined	Custodian × 3

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