Math & Science ⇒ How to recognize the hyperbolic secant

[airjuan]

Hi everybody,
I use Lyx 1.6
It does not recognize the hyperbolic secant (\sech):


Does someone know which package I should download?

[localghost]

Load the amsmath package and declare the hyperbolic secant as a math operator.

Code: Select all

\DeclareMathOperator{\sech}{sech}

This operator then will behave like the \sin or \cos command.


Best regards and welcome to the board
Thorsten¹