additional files

agda-experiments/MLTT/Universes.agda

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+{-# OPTIONS --safe --without-K #-}
+
+module MLTT.Universes where
+
+open import Agda.Primitive public
+  using (_⊔_)
+  renaming (lzero to 𝓤₀
+          ; lsuc to _⁺
+          ; Level to Universe
+          ; Setω to 𝓤ω
+          )
+
+variable
+ 𝓤 𝓥 𝓦 𝓣 𝓤' 𝓥' 𝓦' 𝓣' : Universe
+
+
+_̇ : (𝓤 : Universe) → Set (𝓤 ⁺)
+𝓤 ̇ = Set 𝓤
+
+𝓤₁ = 𝓤₀ ⁺
+𝓤₂ = 𝓤₁ ⁺
+
+_⁺⁺ : Universe → Universe
+𝓤 ⁺⁺ = 𝓤 ⁺ ⁺
+
+infix  1 _̇
+

agda-experiments/about-agda-experiments.md

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+# Installing Agda
+
+I added these lines to my configuration.nixos to get a workable Agda installation:
+
+  (agda.withPackages (p: [ p.standard-library ]))
+
+but there were a few issues, so I removed that and installed with
+    cabal update
+    cabal install Agda
+which seemed to work nicely after some hackery with zlib, and installing the standard libraries.
+
+# Owen's Geolog definitions
+
+Owen.agda : Definitions fom Owen's first two lectures about Geolog.
+
+These set up the basic machinery for contexts (signatures), theories and interpolation.
+
+Compile with:
+  agda -c --no-main Owen.agda
+
+# HoTT definitions from Martin Escardo's book "Univalent Foundations" https://arxiv.org/pdf/1911.00580 
+
+  agda -c --no-main MLTT/Universe.agda
+
+Escardo defines everything from the ground up with his own concepts of sets, universes etc.,
+independently of the standard library.
+