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comment Exponentiation In PBC library
@Ajoy, well, in this case l=a/b. It's not quite a rational number. l=a/b is still some field element. Note that 1/b means the inverse of b in the field finite field where the EC is defined in. So, h^l=h^(a/b)=(h^a)^(1/b). There is a function called element_invert to find the invert of b. This should satisfy your purpose.
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answered Exponentiation In PBC library