Namdak Tonpa (maxim) wrote,
Namdak Tonpa
maxim

Cubical Type Theory in a Topos

Axioms:

ax1 : [∀(φ:I Ω).(∀(i:I).φi∨¬φi)⇒(∀(i:I).φi)∨(∀(i:I).¬φi)]
ax2 : [¬(0 = 1)]
ax3 : [∀(i:I).0⊓x=0=x⊓0 ∧ 1⊓x=x=x⊓1] 
ax4 : [∀(i:I).0⊔x=x=x⊔0 ∧ 1⊔x=1=x⊔1].
ax5 : [∀(i:I). cof(i=0) ∧ cof(i=1)]
ax6 : [∀(φψ:Ω). cofφ⇒cofψ⇒cof(φ∨ψ)]
ax7 : [∀(φψ:Ω). cofφ⇒(φ⇒cofψ)⇒cof(φ∧ψ)].


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[1] https://www.cl.cam.ac.uk/~rio22/pdf/Fields-talk.pdf
[2] http://drops.dagstuhl.de/opus/volltexte/2016/6564/pdf/LIPIcs-CSL-2016-24.pdf
[3] http://www.cl.cam.ac.uk/~rio22/agda/cubical-topos/root.html
Tags: cs, groupoid infinity
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