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Set alphabet (set of indeterminates) for a free monoid ring.
- @param X: a STRING which is the alphabet (set of indeterminates) of a free monoid ring. Every letter in X must have a unique occurrence. The order of letters in X is important since it will induce word orderings. For example,
NCo.SetX("xyz");
NCo.SetOrdering("LLEX");
defines the length-lexicographic ordering induced by x>y>z.
NCo.RingEnv();
Coefficient ring : Q
Ordering : LLEX
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NCo.SetX("xyz");
NCo.RingEnv();
Coefficient ring : Q
Alphabet : xyz
Ordering : LLEX
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