Proposal: Data.Bool.implies

[Petr Pudlák]

+1 for distinguishing <= and implies. Ordering should not be tied to
logical meaning.

po 18. 1. 2016 v 19:38 odesílatel Henning Thielemann <
lemming at henning-thielemann.de> napsal:

>
> On Mon, 18 Jan 2016, Brent Yorgey wrote:
>
> > I disagree.  The equivalence between `implies` and (<=) depends on the
> > ordering chosen for Bool, which is completely arbitrary, and is not
> > something people thinking about logic should be expected to know or
> > learn.  For example, the Coq standard library happens to choose the
> > other order, with True < False.
>
> I can confirm that the order is arbitrary. I used a Modula II
> implementation where True was represented as -1, because that is the bit
> pattern where all bits are
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