Hi, everyone.
I know the type  :(M,N)finite_sum in library "Definition of finite Cartesian 
product types".  What is the difference between (:M+N) and  :(M,N)finite_sum? 
Is there the theorem |- dimindex (:M+N) = dimindex(:M)+dimindex(:N) in the 
existing library?
Thank you very much.
Best regards,
Liming
 
2018-03-16
liliminga
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