thus Sum (digits (2350,10)) =
(Sum <%0,5,3%>) + (Sum <%2%>)
by Th1197, AFINSQ_2:55
.=
((Sum <%0,5%>) + (Sum <%3%>)) + (Sum <%2%>)
by AFINSQ_2:55
.=
((0 + 5) + (Sum <%3%>)) + (Sum <%2%>)
by AFINSQ_2:54
.=
((0 + 5) + 3) + (Sum <%2%>)
by AFINSQ_2:53
.=
8 + 2
by AFINSQ_2:53
.=
10
; verum