Foundations of Physics

, Volume 43, Issue 4, pp 568-596

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

The Notion of Order in Mathematics and Physics. Similarity, Difference and Indistinguishability

  • Georg WikmanAffiliated withSwedish Herbal Institute Research & Development Email author 


The notion of order as a universal and fundamental conceptual category is discussed as being based on sets of similar differences and different similarities. A discussion of relationships between order and disorder is followed by a proposal for a mathematical theory based on non-ordinality which could also have relevance for indistinguishables in physics.


Order Similarity Difference Indistinguishability Indistinguishables