
theorem Th282:
Sum digits(38,10) = 11
proof
  thus Sum digits(38,10) = Sum <%8%>+Sum <%3%> by Th281,AFINSQ_2:55
  .= 8 + Sum <%3%> by AFINSQ_2:53
  .= 8+3 by AFINSQ_2:53
  .= 11;
end;
