Mimicking the spacing of DeclareMathOperator

Question

I would like to mimic the spacing behavior of DeclareMathOperator without using a macro. I would like there to be a space after Spec when I write (in math mode)

mathrm{Spec} k.

But I would like there to be no space after Spec when I write

mathrm{Spec} (k).

Is there a way to do this? Sort of like xspace but not in a macro.

Donald Arseneau · Accepted Answer

With amsmath package loaded
[ operatorname{Spec} k - operatorname{Spec} (k) ]

or without amsmath
[ mathop{mathrm{Spec}} k - mathop{mathrm{Spec}} (k) ]

If you ever want superscripts or subscripts with the primitive mathop, you should add nolimits
[ mathop{mathrm{Spec}}nolimits^2 k - mathop{mathrm{Spec}} (k^2) ]

Mimicking the spacing of DeclareMathOperator

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