General ⇒ crossing an item with an arrow?

[dragan_k]

Hello!!
I hope that someone will be able to help me with my problem - how to cross an item with an arrow when it equals zero? Or, how to put an arrow over an item, with zero on the top of the arrow?
Thanks a lot!!

[gmedina]

how to cross an item with an arrow when it equals zero?

Use the cancel package. An example (after adding in the preamble \usepackage{cancel}):

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$\cancelto{0}{(1-1)}$

...how to put an arrow over an item, with zero on the top of the arrow?

Try something like this

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$\overbrace{(1-1)+(1-1)+(1-1)}^{0}$

or

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$\stackrel{0}{\overrightarrow{(1-1)+(1-1)+(1-1)}}$

Edit: added the \cancelto example.

[dragan_k]

Use the cancel package.

That's what i was looking for!!
Thank you very much!!