/** Absolute value. */
DECLARE_FUNCTION_1P(abs)
+
+/** Complex sign. */
+DECLARE_FUNCTION_1P(csgn)
+
+/** Eta function: log(a*b) == log(a) + log(b) + eta(a, b). */
+DECLARE_FUNCTION_2P(eta)
/** Sine. */
DECLARE_FUNCTION_1P(sin)
/** Trilogarithm. */
DECLARE_FUNCTION_1P(Li3)
-// overloading at work: we cannot use the macros
+// overloading at work: we cannot use the macros here
/** Riemann's Zeta-function. */
extern const unsigned function_index_zeta1;
inline function zeta(const ex & p1) {
}
/** Gamma-function. */
-DECLARE_FUNCTION_1P(gamma)
+DECLARE_FUNCTION_1P(lgamma)
+DECLARE_FUNCTION_1P(tgamma)
/** Beta-function. */
DECLARE_FUNCTION_2P(beta)
-// overloading at work: we cannot use the macros
+// overloading at work: we cannot use the macros here
/** Psi-function (aka digamma-function). */
extern const unsigned function_index_psi1;
inline function psi(const ex & p1) {
/** Order term function (for truncated power series). */
DECLARE_FUNCTION_1P(Order)
-/** Inert differentiation. */
-DECLARE_FUNCTION_2P(Diff)
-
/** Inert partial differentiation operator. */
DECLARE_FUNCTION_2P(Derivative)