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in the 1960s, the rorschach was the most widely used projective test.
:rorschach testi 1960'lı yıllarda en yaygın kullanılan projektif testtir .

girard desargues (; 21 february 1591–september 1661) was a french mathematician and engineer, who is considered one of the founders of projective geometry.
girard desargues (d. 21 Şubat 1591 - ö. ekim 1661), tasarı geometrinin kurucularından biri olarak görülen, eski fransız matematikçi ve mühendis.

:: chapter 10: the exterior product and exterior algebras* "the grassmann method in projective geometry" a compilation of english translations of three notes by cesare burali-forti on the application of exterior algebra to projective geometry* c. burali-forti, "introduction to differential geometry, following the method of h. grassmann" an english translation of an early book on the geometric applications of exterior algebras* "mechanics, according to the principles of the theory of extension" an english translation of one grassmann's papers on the applications of exterior algebra
:: chapter 10: the exterior product and exterior algebras* "the grassmann method in projective geometry" a compilation of english translations of three notes by cesare burali-forti on the application of exterior algebra to projective geometry* c. burali-forti, "introduction to differential geometry, following the method of h. grassmann" an english translation of an early book on the geometric applications of exterior algebras* "mechanics, according to the principles of the theory of extension" an english translation of one grassmann's papers on the applications of exterior algebra