Fix CNF and DNF transformations #128
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Now CNF and DNF formulas can contain quantifiers, followed by a matrix that is in a normal form. Any PNF can be converted to a CNF and DNF without Skolemization. CNFClauseSet and DNFClauseSet are replacing the old CNF and DNF for a quantifier-free representation, obtained after Skolemization.
CNF -> Cnf DNF -> Dnf FOF -> Fof SNF -> Snf PNF -> Pnf PCF -> Pcf
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CNF and DNF data structures now support quantifiers (universal and existential), followed by a matrix in normal form.
This allows for converting to CNF/DNF without Skolemization, which is needed for implementing certain transformation algorithms to GNF (will be implemented next). Now, any formula in PNF can be converted to CNF/DNF.
New types
CnfClauseSetandDnfClauseSetare replacing the old structuresCnfandDnf, accompanied with new traitsToCnfClauseSetandToDnfClauseSet, which is used to convert a formula that is already inSnf.Minor refactoring includes: applying clippy suggestions and renaming formula types to ones that are idiomatic in rust (e.g.,
CNF->Cnf,FOF->Fof, etc.).