∀y,x,f:Top. (int_term_value(f;x "+" y) ~ int_term_value(f;x) + int_term_value(f;y))
{ (UnivCD THENA Auto) }
1. y : Top@i
2. x : Top@i
3. f : Top@i
⊢ int_term_value(f;x "+" y) ~ int_term_value(f;x) + int_term_value(f;y)