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Incorrect solution to BDD difference bug #5

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jclark opened this issue Dec 15, 2021 · 1 comment
Open

Incorrect solution to BDD difference bug #5

jclark opened this issue Dec 15, 2021 · 1 comment

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@jclark
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jclark commented Dec 15, 2021

It turns out there is a bug in the Castagna paper for BDD difference (confirmed with Castagna) and it is necessary to materialize the unions when the atoms are equal

ballerina-platform/nballerina#757 (comment)

This means fixing #3 by using the formula in the Castagna paper is not the correct fix.

Also worth noting is that your formula for complement is different from the formula in the Frisch PhD thesis. Your one is right, and the thesis one is wrong.
@jclark jclark mentioned this issue Dec 15, 2021
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@jclark
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jclark commented Mar 25, 2022

There's a new version of the Covariance and Contravariance paper on Castagna's home page with the correct formula

https://www.irif.fr/~gc/papers/covcon-again.pdf

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