Babak S.

27,460 reputation

21249

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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.

	27,460 reputation	bio	website	facebook.com/bsorouh	visits	member for	2 years, 2 months
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793 Answers

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20	How to compute $\sqrt{i + 1}$
15	Is there an easy way to calculate $\displaystyle\lim_{k \to \infty} \frac{(k+1)^5(2^k+3^k)}{k^5(2^{k+1} + 3^{k+1})}$?
14	Is this group abelian?
13	Show that $({\mathbb{Q}},+)$ is not finitely generated using the Fundamental Theorem of Finitely Generated Abelian Groups.
12	How do you graph $x + y + z = 1$ without using graphing devices?

27,460 Reputation

+10	Show that no number of the form 8k + 3 or 8k + 7 can be written in the form $a^2 +5b^2$
+10	Cost and Marginal cost
+10	Action of $S_7$ on the set of $3$-subsets of $\Omega$
+10	Integration with change of variables (multivariable).

155 Questions

votes activity newest

21	There are at most two prime numbers dividing $\|G\|$
21	Can $G≅H$ and $G≇H$ in two different views?
13	Fractals reference
12	The classification all finite groups which possess a single proper non-trivial normal subgroup
11	Contradiction! Any Symbol for?

160 Tags

459 group-theory × 248	153 linear-algebra × 59
401 calculus × 162	142 integral × 54
369 abstract-algebra × 142	127 limit × 46
326 homework × 124	112 sequences-and-series × 37
224 differential-equations × 89	110 integration × 37