On this picture basic or common junctors of mathematical logic can be seen formalized in Frege's notation system, in his work Begriffsschrift. Let it be a freeware picture.

The picture may contain some minor mistakes. Please, if you find one, tell me about it on my talkpage. Gubbubu

I linked to this picture in my article Fogalomírás; in Hungarian Wikipedia.

Picture made by the uploader editor with a freeware text editor on the day below: Gubbubu 20:34, 29 Apr 2005 (UTC)

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