[[K-monoid|-ring]]
Algebra of Laurent polynomials
Let be a field.
The algebra of Laurent polynomials in indeterminate is a -graded commutative [[K-monoid|-ring]], with elements of the form
such that has finite support,
with multiplication given by .
It is isomorphic to the group algebra .
Properties
- The degree derivation is given formally by
- The derivations of form the Witt algebra.
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