Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
EXAMPLES FROM THE WEB FOR P-N
With unit load in the position shown, the load at D′ is (p-n)/p, and that at E′ is n/p.
The loads at D′, E, due to unit weight on the rail girder are (p-n)/p and n/p.