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Add ordering for a vector of variables #327

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Add ordering for a vector of variables #327

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4 changes: 4 additions & 0 deletions src/comparison.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -302,6 +302,10 @@
ordering(::Type{<:AbstractMonomial}) = Graded{LexOrder}
ordering(::Type{P}) where {P} = ordering(monomial_type(P))
ordering(p::AbstractPolynomialLike) = ordering(typeof(p))
# Useful for instance to ask ordering given the list
# of variables
ordering(::AbstractVector{T}) where {T} = ordering(T)
ordering(t::Tuple) = ordering(first(t))

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# We reverse the order of comparisons here so that the result
# of x < y is equal to the result of Monomial(x) < Monomial(y)
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