
theorem Th236:
Sum digits(136,10) = 10
proof
  thus Sum digits(136,10) = Sum <%6,3%>+Sum <%1%> by Th235,AFINSQ_2:55
  .= (6 + 3) + Sum <%1%> by AFINSQ_2:54
  .= 9 + 1 by AFINSQ_2:53
  .= 10;
end;
