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location Kleve, Germany
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visits member for 1 year, 11 months
seen Sep 7 at 19:06

Jul
24
comment Division with Remainder
$48 \equiv 0 \mod 12$ should also be the result of your calculator.
Jul
22
comment Euler's proof for the infinitude of the primes
Hi, if you got expressions like $a = \sum_n a_n$ and $b = \sum_n b_n$ then $a\cdot b = \sum_n( \sum_{k\leq n} a_kb_{n-k} )$. This lets you easily see why it is true for a product of expessions like $1/(1-p_1^{-1})$ and $1/(1-p_2^{-1})$. I think that you can get something similar for finite products by induction.
Jul
8
comment $[V,fW] = f [V,W] + V(f) W $ Lie product
Yes, sure. Thanks !
Jul
8
accepted $[V,fW] = f [V,W] + V(f) W $ Lie product
Jul
8
asked $[V,fW] = f [V,W] + V(f) W $ Lie product
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
21
comment differentiability check
You don't have to require that $f$ must be defined in $x=2$ since $2$ only has to be a limitpoint of it's domain.
Jun
18
accepted Locally convex space - closed sets
Jun
18
comment Locally convex space - closed sets
How can we make $f_A$ with Hahn-Banach ?
Jun
18
asked Locally convex space - closed sets
Jun
13
accepted Supremum / Infimum
Jun
12
asked Supremum / Infimum
May
27
comment Borel-Cantelli Lemma “Corollary” in Royden and Fitzpatrick
You could also write $E$ as $\{x : f(x) < \infty \}$ where $f(x) = \sum_{n=1}^\infty \chi_{E_n}(x)$.
May
24
comment Graded tensor algebra
Is there some simple argument to show that this is well defined ?
May
24
accepted Graded tensor algebra
May
24
revised Graded tensor algebra
edited body
May
24
revised Graded tensor algebra
added 201 characters in body
May
24
comment Graded tensor algebra
I still don't understand how we get a multiplication on $T(V)$. What do you mean by "extending by bilinearity" ?
May
24
asked Graded tensor algebra