1 files changed, 2 insertions, 0 deletions
diff --git a/Sum.thy b/Sum.thy
index 1e6e6b0..93fa791 100644
--- a/Sum.thy
+++ b/Sum.thy
@@ -51,7 +51,9 @@ and
     \<rbrakk> \<Longrightarrow> indSum[A,B] C f (a,b) \<equiv> f a b"
 
 lemmas Sum_rules [intro] = Sum_form Sum_intro Sum_elim Sum_comp
+lemmas Sum_elims [dest] = Sum_elim  \<comment> \<open>Declaring positively-presented dependent elimination rule as [dest] instead of [elim] arguably makes more sense.\<close>
 lemmas Sum_form_conds [elim, wellform] = Sum_form_cond1 Sum_form_cond2
+lemmas Sum_comps [comp] = Sum_comp
 
 \<comment> \<open>Nondependent pair\<close>
 abbreviation Pair :: "[Term, Term] \<Rightarrow> Term"  (infixr "\<times>" 50)