Waldek Hebisch <hebi...@math.uni.wroc.pl> writes:

[...]

| To say this differently: --T = T but there are x such that
| --x ~= x.

Yep.  See simplifyOneStep in

   
http://svn.open-axiom.org/viewvc/open-axiom/trunk/src/algebra/boolean.spad.pamphlet?revision=2022&view=markup

-- Gaby

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