
theorem Th1182:
Sum digits(2075,10) = 14
proof
  thus Sum digits(2075,10) = Sum <%5,7,0%>+Sum <%2%> by Th1181,AFINSQ_2:55
  .= Sum <%5,7%> + Sum <%0%> + Sum <%2%> by AFINSQ_2:55
  .= (5 + 7) + Sum <%0%> + Sum <%2%> by AFINSQ_2:54
  .= (5 + 7 + 0) + Sum <%2%> by AFINSQ_2:53
  .= 12 + 2 by AFINSQ_2:53
  .= 14;
end;
