
theorem Th1032:
Sum digits(1495,10) = 19
proof
  thus Sum digits(1495,10) = Sum <%5,9,4%>+Sum <%1%> by Th1031,AFINSQ_2:55
  .= Sum <%5,9%> + Sum <%4%> + Sum <%1%> by AFINSQ_2:55
  .= (5 + 9) + Sum <%4%> + Sum <%1%> by AFINSQ_2:54
  .= (5 + 9 + 4) + Sum <%1%> by AFINSQ_2:53
  .= 18 + 1 by AFINSQ_2:53
  .= 19;
end;
