>
> Btw. shouldn't that be
>
>    sage: a == b  
>

not for *formulas*, since say also involve the syntax.
In terms of polynomials
(a+b)*c==a*b+b*c
But  they are different formulas.
Anyway: I recommend to
multiply the the prop. calc. formulas by converting them to
Boolean polynomials (in the quotient ring).

Then you can check their equality (even for quite complex formulas
using PolyBoRi).

There are essentially two mappings:
1->False
0->True
*->Or

or

1->True
0->False
*->AND

Michael

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