for exponential operator which library is used in vhdl

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http://vhdl.renerta.com/mobile/source/vhd00047.htm
the exponentiation operator is under the miscellaneous group in the STANDARD package in the STD library.

I believe it may only work with constants or powers of two (for variable exponents 2**N, i.e. a shift operation).

There is also a fixed point library that exists (mentioned here) that may have a exponentiation function, but I'm not sure as I haven't looked through the files. **broken link removed**
 
A google search for "exponentiation operator vhdl" will yield a few useful results. For example see the very first hit.

Hopefully this will help you with formulating google searches in the future. Well, we can always hope.
 

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