some more comments and cleanups to mul::expand() and ncmul::expand()

[ginac.git] / ginac / indexed.h

diff --git a/ginac/indexed.h b/ginac/indexed.h
index 363bbe8e48993fd151e162078f08f28b1f60de53..b5a0dcedff199d0773644bc07e53e7ad9a3f1a6d 100644 (file)
--- a/ginac/indexed.h
+++ b/ginac/indexed.h
@@ -151,6 +151,7 @@ public:
        exvector get_free_indices(void) const;
 
 protected:
+       ex derivative(const symbol & s) const;
        ex thisexprseq(const exvector & v) const;
        ex thisexprseq(exvector * vp) const;
        unsigned return_type(void) const { return return_types::commutative; }