We'll define   (Sigma repeated m over n) as follows:

		for all natural n	Definition 1.1
		for all natural m and n	Definition 1.2
Properties of Sigma repeated:
			Property 1
			Property 2
			Property 3
			Property 4
			Property 5
			Property 6

The Sigma repeated matrix
To the right:  indicated in darkblue - down: 'n' indicated by  in the second column.

The main diagonal has been indicated.
The matrix is symmetrical with regard to this diagonal.
The sub-diagonals are Pascal's triangle.
In yet another form it emerges as the coefficients matrix of the primus.
It also played a crucial role in determining the general term of U(a,b,c)F.