A more accurate formula, valid in a wider range of conditions is derived by Piwinski.

Every formula valid in all structures is provable.

Therefore, the Davis-Putnam algorithm only terminates on valid formulas.

In propositional logic, there is no distinction between a tautology and a logically valid formula.

In 1995 Kirk's Approximation, a formula valid when K is small but non-zero was published.

Within mathematics, assertions must always be proven mathematically and expressed in a valid and scientifically correct formula.

Conversely, a deductive system is complete if every logically valid formula is derivable.

DEC) is a valid formula; you don't have to refer back to cells on the worksheet to understand it.

An axiom system is complete when every valid formula is derivable as a theorem of that system.

The valid formula under these conditions for the phase shift cross section is: