Email Group

Study Groups

Featured Investigations

Featured Projects

Math 4 Wisdom

Wondrous Wisdom


Steering Committee

Creative Exposition


  • Andrius Kulikauskas
  • m a t h 4 w i s d o m @
  • g m a i l . c o m
  • +370 607 27 665
  • Eičiūnų km, Alytaus raj, Lithuania

Thank you, Participants!

Thank you, Veterans!

Thank you, Commoners!

Thank you, Supporters!

edit SideBar

Research Program




  • Twosome
    • For existence rather than participation
    • Examples:

Opposites coexist and all is the same

  • Tensor product (opposites coexist, in parallel, geometry (homogeneous choice)) vs. Homset functor (all is the same, in series, algebra (step-by-step)).

Free will and fate

  • Free will (range) and fate (domain) - functions - everything in the domain must get assigned an output but not everything in the range must get assigned an input.
  • Limits (softwiring external relationships) colimits (hardwiring internal structure). Softwiring precedes hardwiring.

Outside and inside

  • Outside-inside (orientable - nonorientable)

"Interestingly, a graphic has the power to evoke feelings of understanding, without really meaning much. The same is true for text: it is possible to use a language such as English to express ideas that are never made rigorous or clear. When someone says “I believe in free will,” what does she believe in? We may all have some concept of what she’s saying—something we can conceptually work with and discuss or argue about. But to what extent are we all discussing the same thing, the thing she intended to convey?" Spivak, Category Theory for Scientists (free version) pg.7

Theory and practice

  • Algorithm off and algorithm on

Same and different

  • Same (indistinguishable) - different (distinguishable). Twelvefold way - combinatorics.
  • Sameness + difference. (Dvejybės atvaizdas) (Same means "combine like units" and different means "list separate units")
  • There are only two (-1)-categories, "same" ({$x=y$}) and "different" ({$x\neq y$}), for they are the possible values of {$\textrm{hom}(x,y)$}, which are the 0-morphisms, which are simply the identity morphisms in a set of objects. If {$y=x$}, then we have the identity morphism, and otherwise we have the empty set.

Abstract theory (questions) and concrete examples (answers)

Type and term

  • Type is a question, term is an answer.
  • Type is a unit, term is an amount.
  • Logically, the point of any term is an answer.
  • Not having a term is not having an answer. An answer "no" is rather an answer to the negation of the type, an answer about the negation. This is the essence of type theory.


  • Discuss yin-yang.
  • Seven kinds of duality - sevensome. Will relate to Bott periodicity.
  • Male-female gender.
  • Two-cycle Bott periodicity for complex numbers.
  • nLab: Aufhebung: The mathematics of yin and yang Lawvere's example of {$N_{even}$} and {$N_{odd}$} illustrates same and different.
Edit - Upload - History - Print - Recent changes
This page was last changed on August 01, 2022, at 02:06 PM