I was at the meeting in LogroƱo and my impression was that we had to live with 
these different formalisations. There was no way to unify them and the best one 
could hope to transfer certain results from one formalisation to another using 
local types in some incredibly complicated way.

If there really is a common basis for formalising linear algebra than I would 
be thrilled to see it, and I'm sure we could figure out a way to implement this.


> On 26 Feb 2018, at 14:57, Fabian Immler <imm...@in.tum.de> wrote:
> We do have the problem that AFP/Jordan_Normal_Form/Matrix and 
> Analysis/Finite_Cartesian_Product both formalize vectors and matrices and 
> that there are formalizations of (aspects of) linear algebra for both of 
> them. Last year in Logrono, there was the proposal to put all linear algebra 
> on the common foundation of a locale for modules, but apparently nobody has 
> found the time and motivation to push this much further.
> Perhaps a more humble first step towards unifying the existing theories would 
> be to move AFP/Jordan_Normal_Form/Matrix to the distribution and do the 
> construction of Finite_Cartesian_Product.vec as a subtype of Matrix.vec.
> Any opinions on that?

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