class RDF::N3::Algebra::Math::Difference

The subject is a pair of numbers. The object is calculated by subtracting the second number of the pair from the first.

@example

{ ("8" "3") math:difference ?x} => { ?x :valueOf "8 - 3" } .
{ ("8") math:difference ?x } => { ?x :valueOf "8 - (error?)" } .
{ (8 3) math:difference ?x} => { ?x :valueOf "8 - 3" } .

@see www.w3.org/TR/xpath-functions/#func-numeric-subtract