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Published online by Cambridge University Press: 20 November 2018
In [1] the Principle of Duality of mathematical logic (which states that the duals of equivalent well-formed formulas are also equivalent) is established by first showing that certain transforms related to the duality transform, also possess this property. The transforms involved are  ,
, ,
,  , and
, and  which are defined as follows.
 which are defined as follows.