Usually means: Collection too large for set.
Definitions Related words Mentions
We found 5 dictionaries that define the word proper class:

General (3 matching dictionaries)
  1. proper class: Collins English Dictionary
  2. proper class: Wiktionary
  3. Proper class: Wikipedia, the Free Encyclopedia

Science (2 matching dictionaries)
  1. Proper Class: Eric Weisstein's World of Mathematics
  2. proper class: PlanetMath Encyclopedia

Definitions from Wiktionary (proper class)

noun:  (set theory) A class which is not a set.

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