for V, A being set
for loc being b₁ -valued Function
for n0 being Nat st not V is empty & A is complex-containing & A is_without_nonatomicND_wrt V & loc /. 1,loc /. 2,loc /. 3,loc /. 4 are_mutually_distinct holds
<*(factorial_inv (A,loc,n0)),(factorial_loop_body (A,loc)),(factorial_inv (A,loc,n0))*> is SFHT of (ND (V,A))