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src/HOL/Proofs/Extraction/Pigeonhole.thy
changeset 76987 4c275405faae
parent 69604 d80b2df54d31 
--- a/src/HOL/Proofs/Extraction/Pigeonhole.thy	Sun Jan 15 16:28:03 2023 +0100
+++ b/src/HOL/Proofs/Extraction/Pigeonhole.thy	Sun Jan 15 18:30:18 2023 +0100
@@ -12,7 +12,7 @@
   We formalize two proofs of the pigeonhole principle, which lead
   to extracted programs of quite different complexity. The original
   formalization of these proofs in {\sc Nuprl} is due to
-  Aleksey Nogin @{cite "Nogin-ENTCS-2000"}.
+  Aleksey Nogin \<^cite>\<open>"Nogin-ENTCS-2000"\<close>.
 
   This proof yields a polynomial program.
 \<close>
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