E1 = size 2 by 3 arity-2 Expression of double:
[ 1 4 2 ]
[ 3 9 6 ]

E2 = size 2 by 3 arity-2 Expression of double:
[ 7 2 5 ]
[ 4 8 9 ]

E1+E2 = size 2 by 3 arity-2 Expression of double:
[ 8 6 7 ]
[ 7 17 15 ]

E1-E2 = size 2 by 3 arity-2 Expression of double:
[ -6 2 -3 ]
[ -1 1 -3 ]

E1*E2 = size 2 by 3 arity-2 Expression of double:
[ 7 8 10 ]
[ 12 72 54 ]

E1/E2 = size 2 by 3 arity-2 Expression of double:
[ 0.142857 2 0.4 ]
[ 0.75 1.125 0.666667 ]

-E1 = size 2 by 3 arity-2 Expression of double:
[ -1 -4 -2 ]
[ -3 -9 -6 ]

1/E2 = size 2 by 3 arity-2 Expression of double:
[ 0.142857 0.5 0.2 ]
[ 0.25 0.125 0.111111 ]

2*E1 = size 2 by 3 arity-2 Expression of double:
[ 2 8 4 ]
[ 6 18 12 ]

E2/2 = size 2 by 3 arity-2 Expression of double:
[ 3.5 1 2.5 ]
[ 2 4 4.5 ]

E1+3 = size 2 by 3 arity-2 Expression of double:
[ 4 7 5 ]
[ 6 12 9 ]

3+E1 = size 2 by 3 arity-2 Expression of double:
[ 4 7 5 ]
[ 6 12 9 ]

E2-4 = size 2 by 3 arity-2 Expression of double:
[ 3 -2 1 ]
[ 0 4 5 ]

4-E2 = size 2 by 3 arity-2 Expression of double:
[ -3 2 -1 ]
[ 0 -4 -5 ]

(10-2*E1+3*E2)/4 = size 2 by 3 arity-2 Expression of double:
[ 7.25 2 5.25 ]
[ 4 4 6.25 ]

