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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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DELTA(x[,y])
DELTA function tests for numerical equivalence of two arguments, returning 1 in case of equality. @y is optional, and defaults to 0.
If either argument is non-numeric returns a #VALUE! error.
This function is Excel compatible.
DELTA(42.99,43) equals 0.
EXACT, GESTEP.