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 Yearling
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Jan
20
comment $G = \left\{1, -1\right\}$ is a group under multiplication
Associativity is : for all $(a,b,c) \in G^3$ we have $a\times(b \times c)=(a \times b) \times c$
Oct
20
comment About continuity of a linear forms in $\Bbb R[X]$
Thank's pjs36 for edit, but I think this question is also related to the analysis in a normed space (continuity of linear map, compactness, etc.)
Oct
19
revised About continuity of a linear forms in $\Bbb R[X]$
added 204 characters in body
Oct
19
asked About continuity of a linear forms in $\Bbb R[X]$
Jun
9
awarded  Yearling
Apr
27
revised A function with a bijection
added 1 character in body
Apr
27
reviewed Approve $\int_a^{b} f(x) dx$ exists then so does $\int_{a+c}^{b+c} f(x-c)dx$
Mar
17
awarded  Popular Question
Mar
1
revised A function with a bijection
deleted 132 characters in body
Mar
1
revised A function with a bijection
deleted 10 characters in body
Mar
1
revised A function with a bijection
added 85 characters in body
Mar
1
asked A function with a bijection
Jan
30
accepted Zero variance Random variables with density
Jan
30
comment Zero variance Random variables with density
@ Eupraxis1981 : This is exactly what I wanted for my question. Thank you for explaining.
Jan
29
comment Zero variance Random variables with density
@jameselmore : If $X$ is a r.v. with density $f$, then $p(X=m)=\int_m^m f(t) dt=0$. Is'nt true ?
Jan
29
asked Zero variance Random variables with density
Dec
29
comment About a limit with Euler $\Gamma$ function.
it's awesome work Felix! Thank you!
Dec
29
accepted About a limit with Euler $\Gamma$ function.
Dec
29
comment About a limit with Euler $\Gamma$ function.
@Mhenni: There is my solution about the limit of $G$ :Let use put: $F(x)=\int_x^{+\infty} t^{x-1} e^{-t} dt$ and: $u=\frac{t}{x}.$ That gives : $F(x)= x^x \int_1^{+\infty}u^{x-1}e^{-ux} du$. If $x > 1$ then: $F(x) \geq x^x \int_1^{+\infty}e^{-ux} du =x^{x-1}e^{-x} \to +\infty$ when $x \to +\infty$.
Dec
29
reviewed Approve In base 10, $101 \times 12 = 1212,$ $1001\times 326 = 326326$ Does these numbers have a name in any base?