Eric

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visits	member for	1 year, 7 months
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14 Questions

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6	Tensor on Exterior Algebra
5	Solving the Direct (or Inductive) Limit
5	Nice formula for $\sum\limits_{d\|n}(-1)^{n/d}\Phi(d)$?
3	Is the action transitive?
2	Question on computing direct limits

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334 Reputation

+5	Infinite products (involving complex numbers)
+35	Prove That $\|a +b\| = \|a\| +\|b\|$ if $a$ and $b$ Have Same Signs, And $\|a +b\| < \|a\| + \|b\|$ if $a$ and $b$ Have Opposite Signs
+10	Differentiating an infinite sum
+5	Question on computing direct limits

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12 Answers

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4	Find the value of $\frac{1}{d_1}+\frac{1}{d_2}+\dots+\frac{1}{d_k}$.
3	elementary congruence statement proof
2	Prove That $\|a +b\| = \|a\| +\|b\|$ if $a$ and $b$ Have Same Signs, And $\|a +b\| < \|a\| + \|b\|$ if $a$ and $b$ Have Opposite Signs
1	Differentiating an infinite sum
1	Help with showing how $\sin\alpha\cos\beta$ $=$ $\frac{1}{2}(\sin (\alpha + \beta) + \sin(\alpha-\beta))$ using Eulers formula.

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27 Tags

4 factoring × 2	2 absolute-value
3 linear-algebra × 4	1 algebra-precalculus × 2
3 modular-arithmetic × 2	1 sequences-and-series × 2
3 proof-strategy	1 arithmetic
2 functions × 2	1 derivatives

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$Mathematics Stack Exchange$

Mathematics

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