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(*
Example proof document for Isabelle/Isar Proof General,
using symbols.
View and process this document with Unicode Tokens engaged.
For a more exhaustive test of token display, visit the test
file etc/isar/TokensAcid.thy. Check the FAQ for more advice.
$Id$
*)
theory "Example-Tokens" imports Main begin
text {* Proper proof text -- \<^bitalic>naive version\<^eitalic>. *}
theorem and_comms: "\<phi> \<and> \<psi> \<longrightarrow> \<psi> \<and> \<phi>"
proof
assume "\<phi> \<and> \<psi>"
then show "\<psi> \<and> \<phi>"
proof
assume "\<psi>" and "\<phi>"
then show ?thesis ..
qed
qed
text {* \<^bbold>Unstructured\<^ebold> proof script. *}
theorem "\<phi>\<^isub>\<alpha> \<and> \<phi>\<^isub>\<beta> \<longrightarrow> \<phi>\<^isub>\<beta> \<and> \<phi>\<^isub>\<alpha>"
apply (rule impI)
apply (erule conjE)
apply (rule conjI)
apply assumption
apply assumption
done
end
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