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seen Jul 19 '12 at 6:31

Jul
13
answered Less than infinity or Less or Equal to infinity
Jul
4
answered Number of natural and real numbers
Jul
4
comment How to find the equation of a line tangent to a function
Sorry, I did have a mistake with that cube root. Still, that function is not differentiable at 0 (and doesn't have a tangent line there).
Jul
4
awarded  Commentator
Jul
4
comment How to find the equation of a line tangent to a function
Talking about differentiablity in the edge of the domain where the function is defined is problematic, (note that the function isn't defined in x<0), since one can only find a one sided limit in that edge. The (two sided) limit isn't defined, hence we can not talk about a derivative, all the more so on a tangent line. In any case, a function can't have a tangent line in a point where the function is non differentiable. The (non formal) definition of differentiablity is "if the function can be line-wise approximated in a point".
Jul
4
answered How to find the equation of a line tangent to a function
Jun
16
comment Defining a linear map via kernel and image.
Thanks you very much!
Jun
16
awarded  Scholar
Jun
16
accepted Defining a linear map via kernel and image.
Jun
16
comment Defining a linear map via kernel and image.
So can I do that with any given dimension of the image (in my case 2)? (see my updated question) and by so define a linear map?
Jun
16
revised Defining a linear map via kernel and image.
added 432 characters in body
Jun
16
asked Defining a linear map via kernel and image.
Jun
16
awarded  Self-Learner
Jun
16
comment Problem about characteristic polynomial, eigenvalues
Right, but in this case it does, because both matrices have the maximal (3) number of different eigenvalues, hence can be diagonalized to the same matrix...
Jun
16
answered Problem about characteristic polynomial, eigenvalues
Jun
16
awarded  Student
Jun
16
asked Problem about characteristic polynomial, eigenvalues
Jun
16
awarded  Editor
Jun
16
revised Characteristic polynomials of powers and sums of matrices
added 231 characters in body
Jun
16
comment Characteristic polynomials of powers and sums of matrices
and about multiplication of matrices?