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(*
Example proof script for Isabelle Proof General.
$Id$
Just a version of Example.ML using XSymbol.
Also subscripts/superscripts: A\<^sup>1 \\<or> A\<^sub>2
[NB: these can't be used in identifiers or otherwise
parsed by Isabelle unless declared as part of a theory's
concrete syntax, see docs or examples in HOL/IMP.]
*)
Goal "A \\<and> B \\<longrightarrow> B \\<and> A";
by (rtac impI 1);
by (etac conjE 1);
by (rtac conjI 1);
by (assume_tac 1);
by (assume_tac 1);
qed "and_comms";
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