span V or span(V)

[siwelwerd]

We are apparently inconsistent on this and should pick one and stick with it throughout.

[jkostiuk]

I vote "span(V)"

[siwelwerd]

Discussed during edit-a-thon: consensus is to only use parenthesis where they help clarify things (e.g. ${\rm span}(V \cap W)$ )

[jkostiuk]

agreed, @siwelwerd changed my vote.

[siwelwerd]

Closed by #1034