
theorem Th181:
Sum digits(32,10) = 5
proof
  thus Sum digits(32,10) = Sum <%2%>+Sum <%3%> by Th180,AFINSQ_2:55
  .= 2 + Sum <%3%> by AFINSQ_2:53
  .= 2+3 by AFINSQ_2:53
  .= 5;
end;
