Babak S.

27,485 reputation

21249

bio	website	facebook.com/bsorouh
	location
	age	41
visits	member for	2 years, 2 months
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Counting is a less precise tool for infinite sets than for finite ones. The shepherdess who can count her flock of a hundred sheep will know if the wolf has taken one; but, if she has an infinite flock, she won't notice until almost all of her sheep have been lost.

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Peter J. Cameron

All I am doing here as hints or answers, are dedicated to him.

	27,485 reputation	bio	website	facebook.com/bsorouh	visits	member for	2 years, 2 months
21249 badges		location			seen	1 hour ago

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170

today

+45	12 hours ago	4 events	Integration with change of variables (multivariable).
+40	15 hours ago	4 events	Elementary Linear Algebra
+20	3 hours ago	2 events	Show that no number of the form 8k + 3 or 8k + 7 can be written in the form $a^2 +5b^2$
+20	19 hours ago	2 events	Examples of nonlinear ordinary differential equations with elementary solutions.
+15	2 hours ago	3 events	Action of $S_7$ on the set of $3$-subsets of $\Omega$
+10	3 hours ago	upvote	Vector calculus for ellipse in polar coordinates
+10	7 hours ago	upvote	Cost and Marginal cost
+10	19 hours ago	upvote	What is $-i$ exactly?

yesterday

+40 / -2	22:00	5 events	Examples of nonlinear ordinary differential equations with elementary solutions.
+10	00:57	upvote	inverse of laplace transform
+10	00:56	upvote	Level Sets Questions
+10	00:56	upvote	Find $\mathrm{Aut}(G)$, $\mathrm{Inn}(G)$ and $\mathrm{Aut}(G)/\mathrm{Inn}(G)$ for $G = D_4$
+10	00:55	upvote	Flow of $rot \overrightarrow{F}$
+10	00:54	upvote	Proper constants for $\alpha, \beta$

200

2 days ago

+55	19:21	5 events	Find $\mathrm{Aut}(G)$, $\mathrm{Inn}(G)$ and $\mathrm{Aut}(G)/\mathrm{Inn}(G)$ for $G = D_4$
+30	18:36	3 events	What is $-i$ exactly?
+20	12:49	2 events	inverse of laplace transform
+10	12:50	upvote	Level Sets Questions
+10	10:27	upvote	One dimensional subspaces of a 3 dimensional vector space over $\mathbb Z/3\mathbb Z$, multiple choice
+10	08:06	upvote	Flow of $rot \overrightarrow{F}$
+10	00:17	upvote	Integration factor differential equations?
+10	00:15	upvote	Integration problems
+10	00:13	upvote	On convergence of problematic series.
+10	00:13	upvote	can a line integral of domain $C$ be negative when $C$ is the boundary of the region in the upper half plane? ($y>0$)
+10	00:11	upvote	Test for convergence for improper integral $1/x^x$
+10	00:07	upvote	Solving the domain and range of a region satisfying two inequalities?
+5	02:02	upvote	Finding all groups with $\text{Aut}(G)=\{1\}$

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