Liên kết ngoài Hệ tiên đề Peano

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WikiPedia: Hệ tiên đề Peano http://www.math.uwaterloo.ca/~snburris/htdocs/scav... http://mathworld.wolfram.com/.html http://digisrv-1.biblio.etc.tu-bs.de:8080/docporta... http://www.uni-potsdam.de/u/philosophie/grassmann/... http://www.w-k-essler.de/pdfs/goedel.pdf http://www.utm.edu/research/iep/p/poincare.htm http://www.ams.org/journals/bull/1902-08-10/S0002-... //www.ams.org/mathscinet-getitem?mr=1507856 //www.ams.org/mathscinet-getitem?mr=1833464 //dx.doi.org/10.1007%2F978-94-015-7676-5_8