
theorem Th185:
Sum digits(96,10) = 15
proof
  thus Sum digits(96,10) = Sum <%6%>+Sum <%9%> by Th184,AFINSQ_2:55
  .= 6 + Sum <%9%> by AFINSQ_2:53
  .= 6+9 by AFINSQ_2:53
  .= 15;
end;
