Frege's Judgement Stroke
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This paper brings to light a new puzzle for Frege interpretation, and offers a
solution to that puzzle.  The puzzle concerns Frege's judgement-stroke ('|'),
and consists in a tension between three of Frege's claims.  First, Frege
vehemently maintains that psychological considerations should have no place in
logic. Second, Frege regards the judgement-stroke---and the associated
dissociation of assertoric force from content, of the act of judgement from the
subject matter about which judgement is made---as a crucial part of his logic.  
Third, Frege holds that judging is an inner mental process, and that the
distinction marked by the judgement-stroke, between entertaining a thought and
judging that it is true, is a psychological distinction.  I argue that what
initially looks like confusion here on Frege's part appears quite reasonable
when we remind ourselves of the differences between Frege's conception of logic
and our own.