theorem :: SURREALI:39

for x, y being Surreal st x is positive & y = [(({0_No} \/ (divset ((R_ x),x,(L_ (x "))))) \/ (divset ((L_ x),x,(R_ (x "))))),((divset ((L_ x),x,(L_ (x ")))) \/ (divset ((R_ x),x,(R_ (x ")))))] holds
x " == y