
theorem Th948:
Sum digits(322,10) = 7
proof
  thus Sum digits(322,10) = Sum <%2,2%>+Sum <%3%> by Th947,AFINSQ_2:55
  .= (2 + 2) + Sum <%3%> by AFINSQ_2:54
  .= 4 + 3 by AFINSQ_2:53
  .= 7;
end;
