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I don't know about corners, but in mathematical copy, referring to
the right-HAND (or left-hand) side of an equation is standard, to the
point that the abbreviations RHS (and LHS) are widely understood (or
so I was told the first time I queried them).
Presumably this is to make it clear that one is referring to "right"
as in position rather than "right" as in correct -- not that I'd
know whether or not most of the equations I've looked at were
correct or not!
mnj -at- ornl -dot- gov
DISCLAIMER: I work at Oak Ridge National Laboratory, for Martin
Marietta Energy Systems, Inc., which is under contract to the
U.S. Department of Energy, but I don't speak for any of them,
and they return the favor.