The first differences for a sequence Un is the set of numbers Dn = Un+1 - Un They are the set of numbers obtained by subtracting the first number from the second, the second from the third, and so on.
First. It's UN-fold, as opposed to un-FOLD
in 1984
un in undo means... redo or to do it again
condalezza rice
Hilary Clinton.
Trygve Lie
1953
u. thant
Best Delegate
un manuel des premiers secours, un manuel de secourisme
Mailing Address: UN Headquarters First Avenue at 46th Street New York, NY 10017 USA