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Jun
15
accepted Prove that the class of non-standard models of arithmetics is not axiomatizable
Jun
15
comment Is arrow notation for vectors “not mathematically mature”?
Truer words never spoken.
Jun
15
asked Prove that the class of non-standard models of arithmetics is not axiomatizable
Jun
15
comment Prove that class of models isomorphic to some infinite model $M$ is not countably axiomatizable
Thanks, I guess this argument does it. I didn't make it to relate cardinality to the isomorphy, I guess.
Jun
15
asked Prove that class of models isomorphic to some infinite model $M$ is not countably axiomatizable
May
15
awarded  Popular Question
Jan
4
awarded  Yearling
Dec
17
awarded  Caucus
Dec
11
revised Why there is this kind of relation between power and factorial?
deleted 38 characters in body
Dec
2
asked Is it possible to transform inhomogeneous Robin boundary problem to homogeneous Robin boundary problem?
Dec
2
accepted Prove that partial differential equation has no weak solution
Dec
2
comment Prove that partial differential equation has no weak solution
Thank you for your profound elaboration, this is exactly what I was looking for. My problem was that I could really figure out how $v$ should look like to fulfill given conditions and still stay in $H^1_0(0,1)$.
Dec
2
comment Variational form of boundary value problem
Yes it will do, thank you.
Dec
1
comment Prove that partial differential equation has no weak solution
I am not sure because I suppose weak solutions can differ from classical ones, so $u$ could have another form rather than one above.
Dec
1
comment Prove that partial differential equation has no weak solution
So would it be right to tell that since it is impossible for classical solution $u(x)=\frac{c_1}{x}+c_2+\text{log}(x)$ to have $u(0)=0$, what is a necessary condition for $u$ to be in $H^1_0(0,1)$, then we can't solve our problem in $H^1_0(0,1)$?
Dec
1
revised Prove that partial differential equation has no weak solution
deleted 105 characters in body
Dec
1
asked Prove that partial differential equation has no weak solution
Dec
1
asked Variational form of boundary value problem
Nov
30
accepted For which $s$ is the function $(||x||^{s-2}x_i)^2$ integrable on the unit ball of $\mathbb R^n$?
Nov
25
asked For which $s$ is the function $(||x||^{s-2}x_i)^2$ integrable on the unit ball of $\mathbb R^n$?