# math:exp - XPath XQuery Reference

Returns the value of ex.deterministiccontext-independentfocus-independentIf $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the mathematical constant e raised to the power of
               $arg, as defined in the  specification of
            the exp function applied to 64-bit binary floating point values.math:exp(())()math:exp(0)1.0e0math:exp(1)2.7182818284590455e0math:exp(2)7.38905609893065e0math:exp(-1)0.36787944117144233e0math:exp(math:pi())23.140692632779267e0math:exp(xs:double('NaN'))xs:double('NaN')math:exp(xs:double('INF'))xs:double('INF')math:exp(xs:double('-INF'))0.0e0The treatment of overflow and underflow is defined in .