
theorem Th761:
Sum digits(462,10) = 12
proof
  thus Sum digits(462,10) = Sum <%2,6%>+Sum <%4%> by Th760,AFINSQ_2:55
  .= (2 + 6) + Sum <%4%> by AFINSQ_2:54
  .= 8 + 4 by AFINSQ_2:53
  .= 12;
end;
