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The Principia Mathematica (often abbreviated PM) is a three-volume work on the foundations of mathematics, written by Alfred North Whitehead and Bertrand Russell and published in 1910, 1912, and 1913. In 1925–27, it appeared in a second edition with an important Introduction to the Second Edition, an Appendix A that replaced ✸9 and all-new "Appendix B" and Appendix C.
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Le flore dell' era mesozoica. Pubblicazioni della R. Università degli studi di Firenze, Facoltà agraria e forestale. Firenze, Tipografia M. Ricci 0 out of 5 stars based on 0 ratings.