* Triangle of opposition
* Table of logic symbols

Notes

References

*
* ------, 2001, "Free Logics," in Goble, Lou, ed., The Blackwell Guide to Philosophical Logic. Blackwell.
* ------, 1997. Free logics: Their foundations, character, and some applications thereof. Sankt Augustin: Academia.
* ------, ed. 1991. . Oxford Univ. Press.
* Morscher, Edgar, and Hieke, Alexander, 2001. New essays in free

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