# Jason Howald

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## Registered User

 Name Jason Howald Member for 2 years Seen Dec 9 at 14:41 Website Location Age
 Dec6 awarded ● Scholar Dec6 awarded ● Supporter Dec6 comment If d/dx is an operator, on what does it operate?I am grateful to Joel for his support of the question, including this interesting answer. Certainly $\frac{d}{dx}$ is similar to a quantifier: It "shields" occurrences of the variable $x$ in its scope from direct substitution. It is defined in terms of the limit, which also binds a variable, as a quantifier could. It is a very strange quantifier, though, as $x$ once again occurs free in the ("bound"?) expression $\frac{d}{dx} x^3$ since $\frac{d}{dx} x^3 = 3x^2$. Dec6 awarded ● Popular Question Dec4 awarded ● Editor Dec4 comment If d/dx is an operator, on what does it operate?Thank you for the criticisms. I have rephrased to clarify my intended meaning. Dec4 revised If d/dx is an operator, on what does it operate?Rephrased, motivated by first two comments Dec4 asked If d/dx is an operator, on what does it operate?