Math & Science ⇒ Less than symbol

[azizever83]

Hello,
I am still new in Latex and having so many difficulties. I am trying to write my assignment and not able to make the output of less than or equal sign. I have found almost all tutorials useing the same method. but did not work with me.
here is my attempt but getting an error.

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Arrival_Q \leq Arrival_Q_Size

and also tried to use

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Arrival_Q \leqslant Arrival_Q_Size

the same no way. is there any specific package i have to use?
can u please write me the correct form so that I can use it??
Thanks

[alainremillard]

What kind of error do you get ?

\leq and \geq are math operator, so they have to be in math mode

For example you could write

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$\leq$

But if you are in text mode, the underscore will also get you an error. Please be more specific, or write a minimal working example. It'll help people reproduce your problem.

regards
Alain R