+/* --- @mp_jacobi@ --- *
+ *
+ * Arguments: @mp *a@ = an integer less than @n@
+ * @mp *n@ = an odd integer
+ *
+ * Returns: @-1@, @0@ or @1@ -- the Jacobi symbol %$J(a, n)$%.
+ *
+ * Use: Computes the Jacobi symbol. If @n@ is prime, this is the
+ * Legendre symbol and is equal to 1 if and only if @a@ is a
+ * quadratic residue mod @n@. The result is zero if and only if
+ * @a@ and @n@ have a common factor greater than one.
+ */
+
+int mp_jacobi(mp */*a*/, mp */*n*/);
+