unfold conflict in |- *; cut (e T = Die T T)...
intro; case (Rle_dec (Die T T) ConflictRange); intros;
[ rewrite H; exact r | elim diff_false_true ]...
Qed.

Lemma conflict_T_e_1 : (e T <= ConflictRange)%R -> conflict T = true.
Proof with trivial.