# What's this called? $\mathbb{C}[d/dx]$

The 'ring of differential operators wrt x' ?

Thx.

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The ring of linear differential operators with constant coefficients, rather. – Mariano Suárez-Alvarez Jun 25 '12 at 4:57
@MarianoSuarez-Alvarez: Isn't $\mathbb{C}[d/dx]$ only isomorphic to the aforementioned ring? – Michael Albanese Jan 1 '13 at 1:40
It depends on what, exactly, the notation means, really. – Mariano Suárez-Alvarez Jan 1 '13 at 1:44