[phenixbb] tls definitions

Ralf W. Grosse-Kunstleve rwgk at cci.lbl.gov
Tue Apr 1 10:04:19 PDT 2008

> Ah that's it: I was thinking of it as wanting all those chains in the
> group, rather than as a selection

It is a common source of confusion. A "logical and" isn't the same as a
"colloquial and". At some point I was toying with the idea to implement
"and also" as an alias for "or". I didn't do it in the end because there
is no precedence in any other system implementing atom selections
with the logical not, and, or keywords (e.g. X-PLOR/CNS, PyMOL, VMD
and probably many others).

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