Ben Alpert

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1,764 reputation

925

bio	website	benalpert.com
	location	United States
	age	20
visits	member for	2 years, 10 months
	seen	May 10 at 22:49
stats	profile views	344

Khan Academy / Carnegie Mellon

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13 Answers

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39	How can you prove that the square root of two is irrational?
14	Why is the 2nd derivative written as $\frac{\mathrm d^2y}{\mathrm dx^2}$?
14	Probability that a stick randomly broken in two places can form a triangle
10	Combinations of selecting n objects with k different types
10	Balance chemical equations without trial and error?

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1,764 Reputation

+10	How can you prove that the square root of two is irrational?
+5	Finding $\int_0^{\pi/2} \sin x\,dx$
+10	Combinations of selecting n objects with k different types
+5	Counting how many hands of cards use all four suits

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9 Questions

votes activity newest

12	Finding $\int_0^{\pi/2} \sin x\,dx$
12	Proving Stewart's theorem without trig
10	Tiling a 3 by 2n rectangle with dominoes
8	Probability that two people see each other at the coffee shop
7	Counting how many hands of cards use all four suits

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29 Tags

39 number-theory	14 notation
39 irrational-numbers	13 induction × 2
22 calculus × 3	13 elementary-number-theory × 2
19 probability × 3	10 combinatorics × 5
14 monte-carlo	10 linear-algebra

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27 Accounts

	Stack Overflow	18,187 rep	75990
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	2,381 rep	21728
$Mathematics Stack Exchange$	Mathematics	1,764 rep	925
	Server Fault	1,534 rep	815
	Musical Practice & Performance	1,313 rep	1121

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Nice Answer × 5	Taxonomist
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Popular Question × 2	Organizer
Yearling × 2	Citizen Patrol

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