JuanPi
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 Feb9 revised Generalized polynomial matrix adding reference with some information Feb2 comment Generalized polynomial matrix @MarcvanLeeuwen In the scalar case if we allow $n \rightarrow \infty$ the it would be a generalized Fourier series. For finite $n$, "truncated generalized Fourier series"? Basically the resulting matrix has the entries in the linear span of $\lbrace \phi_i \rbrace$. Have this matrices been studied somewhere? How would you search for literature? I am interested in their kernel. Feb2 asked Generalized polynomial matrix Dec5 comment What is the name of the algebraic structure constructed with an abelian monoid and a field? Thanks a lot, I did not stop to think in this top-to-bottom perspective. Your observation is highly appreciated. I was in the search of name, a keyword, to open the doors for more reading, so I will mark rschwieb answer as "the answer" but yours is also extremely educative! Dec5 accepted What is the name of the algebraic structure constructed with an abelian monoid and a field? Dec4 asked What is the name of the algebraic structure constructed with an abelian monoid and a field? May31 comment Why is propositional logic not Turing complete? IHMO I think that Tunring's model of computation did not required infinite memory. As far as I remember The original paper talks about "unbounded" tape (see eprints.gla.ac.uk/4481/1/4481.pdf?ref=Sex%C5%9Ehop.Com page 3 for a discussion). This means that the length of the tape is unknown a priory but not infinite. Sep17 accepted Distance between real finite dimensional linear subspaces Sep17 comment Distance between real finite dimensional linear subspaces Thank you very much! Sep17 comment Distance between real finite dimensional linear subspaces I need the usual properties of a distance (maybe measure?) d(x,x)=0 iff x=x, d(x,y)>= 0 , etc... Sep17 comment Distance between real finite dimensional linear subspaces Thanks Alex Becker! What happens when the subspaces are of different dimension? Sep17 asked Distance between real finite dimensional linear subspaces Aug18 awarded Supporter Aug18 awarded Student Aug18 awarded Scholar Aug18 awarded Editor Aug18 revised Are translations of logarithms linearly independent? Posting solution Aug18 comment Are translations of logarithms linearly independent? I can't post my answer yet (must wait 7 hours). But I basically followed the steps suggested by paul garrett. Aug18 asked Are translations of logarithms linearly independent? Jun11 awarded Autobiographer