Rate constants in equations

Asha G <[email protected]>
Newsgroups gmane.comp.tex.tugindia
Message-ID <[email protected]> 
How does one put rate constants ( both forward and backward ) in equations
using LaTeX ?

A + B _f_>  C
        <___
            k


This is not very clear as I cannot type in arrows with my laptop but what I
mean is the upper Half arrow  pointing right has f above it and the bottom
half  arrow pointing left has k below  it.

Your help is appreciated.

Thanks

Asha Gopinathan
SCTIMST
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