In the philosophical part of nnLab we discuss higher category theory and its repercussions in philosophy. More widely, the future entries on philosophy in nLab should also contain philosophy of mathematics in general, and of logic and foundations in particular. As it is usual for philosophy and the study of thought, it is usefully carried on via study of historical thinkers and their ideas, hence some idea-related aspects of the history of mathematics are welcome.


There are many articles which are not philosophy, but rather essays on general mathematics, and so on, often opinion pieces on what is important and so on. That is not philosophy per se, but it may be relevant thoughts and we could link them rather at related pages, like opinions on development of mathematics.

Idea of relevance of higher categories

Philosophical interest in n-categories may be characterised as belonging to one of two kinds.

  • Metaphysical: The formation of a new language which may prove to be as important for philosophy as predicate logic was for Bertrand Russell and the analytic philosophers he inspired.

  • Illustrative of mathematics as intellectual enquiry: Such a reconstitution of the fundamental language of mathematics reveals much about mathematics as a tradition of enquiry stretching back several millennia, for instance, the continued willingness to reconsider basic concepts.




“Mathematical wisdom, if not forgotten, lives as an invariant of all its (re)presentations in a permanently self–renewing discourse.” (Yuri Manin)

To categorify mathematical constructions properly, one must have understood their essential features. This leads us to consider what it is to get concepts ‘right’. Which kind of ‘realism’ is suitable for mathematics? Which virtues should a mathematical community possess to further its ends: a knowledge of its history, close attention to instruction and the sharing of knowledge, a willingness to admit to what is currently lacking in its programmes?

Philosophical sentiments




Some philosophical aspects of the role of category theory are touched upon in some parts of the introductory paper

Blog and forum discussions, conferences

  • nnCafé on Mathematical reality: I, II
  • Gavin wrote about “The dangers of category theory”, see nnForum here
  • Simplicityonference: Ideals of Practice in Mathematics & the Arts; videos online at youtube channel

category: philosophy

Revised on October 15, 2017 18:44:30 by Daniel Luckhardt (2a02:810d:640:56d0:218a:d21f:fef9:31ae)