Doctor Fortran in “To .EQV. or to .NEQV., that is the question”, or “It’s only LOGICAL”

Most Fortran programmers are familiar with the LOGICAL data type, or at least they think they are…. An object of type LOGICAL has one of only two values, true or false. The language also defines two LOGICAL constant literals .TRUE. and .FALSE., which have the values true and false, respectively. It seems so simple, doesn’t it? Yes… and no.

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