Almost commutative ring
From HandWiki
In algebra, a filtered ring A is said to be almost commutative if the associated graded ring [math]\displaystyle{ \operatorname{gr}A = \oplus A_i/{A_{i-1}} }[/math] is commutative. Basic examples of almost commutative rings involve differential operators. For example, the enveloping algebra of a complex Lie algebra is almost commutative by the PBW theorem. Similarly, a Weyl algebra is almost commutative.
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