-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Yeah. A similar use-case involves "Wick Contractions". Differences are: 1) It's an "over-bracket", rather than an "under-bracket". 2) The Wick contraction typically doesn't sport a label (though, if one's building a general facility, there's no reason not to allow one). In addition to not respecting the nesting structure of the equation, both tie-bars and Wick contractions can cross (i.e., they, themselves don't have a nested structure). ______________ | | ______________ | | | | | < A B C D A B C D > Jacques -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) Comment: PGP Key - http://golem.ph.utexas.edu/~distler/distler.asc iD8DBQFHfyw5nyqPIXpYcjcRAprbAJ4ytQgpWjQmIICBuAf7iiELpOyIswCg9tma V5BTGlqeAl0yLzvkIeaieo4= =ZpYN -----END PGP SIGNATURE-----Received on Saturday, 5 January 2008 07:05:34 GMT
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