Tham khảo Trừu_tượng_toán_học

  1. ↑ Bertrand Russell, in The Principles of Mathematics Volume 1 (pg 219), refers to "the principle of abstraction".
  2. ↑ Robert B. Ash. A Primer of Abstract Mathematics. Cambridge University Press, 1 tháng 1 năm 1998
  3. ↑ The New American Encyclopedic Dictionary. Edited by Edward Thomas Roe, Le Roy Hooker, Thomas W. Handford. Pg 34
  4. ↑ Proclus' Summary Error in Webarchive template: Empty url.