Following examples show that the interface between sage and Mathematica misinterprets symbolic variables if they are underscored with numbers:
sage: h_20,h_10,h_2,h_3,h20,h10,h_ij,h_kl=var("h_20,h_10,h_2,h_3,h20,h10,h_ij,h_kl");
sage: mexpr=mathematica((h_20+h_10)^3);
sage: print(mexpr);
3
27000 (h_)
sage: mexpr1=mathematica((h20+h10)^3);
sage: print(mexpr1);
3
(h10 + h20)
sage: mexpr2=mathematica((h_2+h_3)^3);
sage: print(mexpr2);
3
125 (h_)
sage: mexpr3=mathematica((h_ij+h_kl)^3);
sage: print(mexpr2);
3
(h10 + h20)
sage: print(mexpr3);
3
((h_ij) + (h_kl))
I use sage-8.1 and Mathematica 11.2.0 at Linux OpenSUSE Leap v42.3. In this forum I haven't found any other comment regarding this funny behaviour.
