Josh Chen

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428 reputation

311

bio	website
	location	Christchurch, New Zealand
	age	21
visits	member for	2 years, 3 months
	seen	May 20 at 10:32
stats	profile views	132

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12 Questions

votes activity newest

10	What exactly does $\frac{\partial(y_1,\dots,y_m)}{\partial(x_1,\dots,x_n)}$ refer to?
8	Does a finite commutative ring necessarily have a unity?
6	Simultaneous equations, trig functions and the existence of solutions
4	Prove that $\cos(x)$ is identically zero using integration by parts
4	$\subset$ vs $\subseteq$ when not referring to strict inclusion

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428 Reputation

+5	$\subset$ vs $\subseteq$ when not referring to strict inclusion
+5	Does a finite commutative ring necessarily have a unity?
+25	Basic Number theory question
+10	How many different combinations of $X$ sweaters can we buy if we have $Y$ colors to choose from?

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5 Answers

votes activity newest

2	How many different combinations of $X$ sweaters can we buy if we have $Y$ colors to choose from?
1	Basic Number theory question
1	Prove that if $A^2=0$ then $A$ is not invertible
0	Which one result in maths has surprised you the most?
0	Interesting properties for numbers 1-20?

29 Tags

2 intuition	0 abstract-algebra × 2
2 combinatorics	0 soft-question × 2
1 linear-algebra × 2	0 multivariable-calculus × 2
1 elementary-number-theory	0 trigonometry
0 notation × 3	0 functional-equations

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4 Accounts

$Mathematics Stack Exchange$	Mathematics	428 rep	311
	Physics	186 rep	5
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	153 rep	14
	Mathematica	101 rep

13 Badges

recent class name

Yearling × 2	Critic
Popular Question	Enthusiast
Tumbleweed	Commentator
Organizer	Teacher
Nice Question	Scholar

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38 Votes Cast

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0	down		24	answer

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