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 Civic Duty
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asked Equality between 3 sets using 3 inclusions
Jan
14
asked Chasle relation with arbitrary ordering of endpoints.
Jan
10
accepted If $f(a_n)\rightarrow f(L)$ then $a_n\rightarrow L$?
Jan
10
asked If $f(a_n)\rightarrow f(L)$ then $a_n\rightarrow L$?
Jan
8
awarded  Civic Duty
Jan
8
accepted In a general definition, a sequence starts at zero or at one?
Jan
8
asked In a general definition, a sequence starts at zero or at one?
Jan
5
accepted Most general first order differential equation
Jan
5
asked Most general first order differential equation
Dec
27
awarded  Popular Question
Dec
16
accepted For any subset $B$, we have $f^{-1}(f(f^{-1}(B)))=f^{-1}(B)$
Dec
16
asked For any subset $B$, we have $f^{-1}(f(f^{-1}(B)))=f^{-1}(B)$
Dec
14
awarded  Popular Question
Dec
10
accepted The span is the set of linear combinations
Dec
10
asked The span is the set of linear combinations
Dec
10
awarded  Popular Question
Dec
8
asked Fourier transform of dirac by two methods
Dec
8
comment A relation preventing from being an automorphism.
of course it holds! but from the relation $(det(u_k))^2=(-1)^n$ we can't say that $n$ is even because $det(u_k)$ is a complex number
Dec
8
comment A relation preventing from being an automorphism.
In the real case it is clear that $n$ must be even so that $(det(u_k))^2=1$ but here we are in the complex case so why $n$ can't be odd ?
Dec
8
comment A relation preventing from being an automorphism.
ah so actually we have that $det(u_k)det(u_l)=(-1)^ndet(u_k)det(u_l)$