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*This function gives the natural logarithm of the absolute value of the Gamma Function.
*This function gives the natural logarithm of the absolute value of the Gamma Function.
*The functions Digamma and Trigamma are the first and second derivatives of the logarithm of the Gamma Function.
*The functions Digamma and Trigamma are the first and second derivatives of the logarithm of the Gamma Function.
*This is often called the ‘Polygamma’ function.
*This is often called the Polygamma function.
*Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions.
*Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions.
*Normally the number <math>e</math> to the power <math>GAMMALN(x)</math>, where <math>x</math> is an integer, is same as <math>(x-1)!</math>.
*Normally the number <math>e</math> to the power <math>GAMMALN(x)</math>, where <math>x</math> is an integer, is same as <math>(x-1)!</math>.