delete all whitespace (space) in a region

[Uwe Brauer <oub@mat.ucm.es>]

Hi

I have constructs like
$\left[ \left( \partial_{t}\Phi  \right)^{2} -                 \left\vert \nabla\Phi \right\vert^{2}   \right]^{\frac{1+K}{2K}}$:

That contain to much ........

So I am looking for a region-wise command deleting all this .. With the result
$\left[\left(\partial_{t}\Phi\right)^{2}-\left\vert \nabla\Phi\right\vert^{2}\right]^{\frac{1+K}{2K}}$:

(defun my-delete-all-whitespace-region (beg end)
  (interactive "r")
  (query-replace " " "" nil beg end nil nil))

Seems to be a very simple solution, but maybe too simple?

Any comments?

Uwe Brauer 

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