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The following are commands and functions within the package sagbi:
SB.IsInSubalgebra
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Subalgebra membership test of a polynomial.
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SB.IsSagbi
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Checks if a set of polynomials is a SAGBI-basis.
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SB.IsSagbiOf
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Checks if a set of polynomials is a SAGBI-basis of a given subalgebra.
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SB.NFS
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Computes the subalgebra normal form of a polynomial with respect to subalgebra generators.
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SB.ReducedSagbi
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Computes the finite reduced SAGBI-basis of a subalgebra if existing.
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SB.Sagbi
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Computes a finite SAGBI-basis of a subalgebra if existing.
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SB.SubalgebraPoly
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Computes a subalgebra polynomial from a subalgebra representation.
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SB.TermRepr
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Computes a representation of a term in other terms if it exists.
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For details look up each item by name. Online, try
?ItemName or
H.Syntax("ItemName").