Even F[1,2,3] is sugar for and sexp. If you treat it like (F 1 2 3) it will work. You can take the head, or "quote" it with Hold. Or you can forget that an imag

Even F[1,2,3] is sugar for and sexp. If you treat it like (F 1 2 3) it will work. You can take the head, or "quote" it with Hold. Or you can forget that an imagine that the language indexes from 1.