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Thank you.

I've downloaded the cancel package in the MiKTeX directory, I wrote in the preamble \usepackage{cancel}, but couldn't use it. I think I made a mistake somewhere. If I didn't specify it, I use LyX.

I try to "cut" a number of four digits to simplify an equation, but I think I don't know the adequate way. I used, for example, \not{1234}, but instead of cutting the whole number, it only cut the first digit. I hope there is a solution for this.

Thanks

Now I understand. Thanks for your help.

I did this, but I can't see any difference. It doesn't automaticaly change my keyboard layout.
Thanks.

Thank you for your effort, but I don't know how to implement your solution to make it work in my documents.

I need to know if there is a posibility for automaticaly change the language between text and math mode. I use romanian in text, but I need english when I insert math formula because of the keyboard layout diferences.