let a, b be Int-Location; :: thesis: SubFrom (a,b) = [3,{},<*a,b*>]
ex A, B being Data-Location st
( a = A & b = B & SubFrom (a,b) = SubFrom (A,B) ) by SCMFSA_2:def 10;
hence SubFrom (a,b) = [3,{},<*a,b*>] ; :: thesis: verum