
theorem Th322:
Sum digits(532,10) = 10
proof
  thus Sum digits(532,10) = Sum <%2,3%>+Sum <%5%> by Th321,AFINSQ_2:55
  .= (2 + 3) + Sum <%5%> by AFINSQ_2:54
  .= 5 + 5 by AFINSQ_2:53
  .= 10;
end;
