Functional Arrays and Tensors. Fatrix:- a matrix of functions.
See this for an introduction and motivation.
A slight modification to matrix algebra.
Traditional dot
a, b . e, f = a.e + b.g, a.f + b.h
c, d g, h = c.e + d.g, c.f + d.h
Functional dot
a, b . e, f = a(e) + b(g), a(f) + b(h)
c, d g, h = c(e) + d(g), c(f) + d(h)
Checkout some examples here.