The Three Crises in Mathematics by E Snapper (1979) [pdf](php.scripts.psu.edu)
php.scripts.psu.edu
The Three Crises in Mathematics by E Snapper (1979) [pdf]
http://php.scripts.psu.edu/faculty/e/c/ecb5/Courses/M475W/WeeklyReadings/Week%2014/Three_Crises_in_Mathematics.pdf
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A clear discussion of logicism, intuitionism, and formalism.