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Tashi Walde authored and Tashi Walde committed Oct 20, 2023
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6 changes: 3 additions & 3 deletions src/hott/03-equivalences.rzk.md
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Expand Up @@ -224,9 +224,9 @@ The type of equivalences between types uses `#!rzk is-equiv` rather than

## Induction with section

We have two variants of induction with section that say that if `f : A → B`
has a section, it suffices to prove statements about `b : B` by doing so terms
of the form `f a`.
We have two variants of induction with section that say that if `f : A → B` has
a section, it suffices to prove statements about `b : B` by doing so terms of
the form `f a`.

```rzk
#def ind-has-section
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6 changes: 2 additions & 4 deletions src/simplicial-hott/04-right-orthogonal.rzk.md
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Expand Up @@ -728,17 +728,15 @@ equivalence.
```rzk
#def is-local-type
: U
:=
is-equiv (ψ → A) (ϕ → A) ( \ τ t → τ t)
:= is-equiv (ψ → A) (ϕ → A) ( \ τ t → τ t)
```

We can ask that the terminal map `A → Unit` is right orthogonal to `ϕ ⊂ ψ`.

```rzk
#def is-right-orthogonal-terminal-map
: U
:=
is-right-orthogonal-to-shape I ψ ϕ A Unit (terminal-map A)
:= is-right-orthogonal-to-shape I ψ ϕ A Unit (terminal-map A)
```

### Unique extensions types are local types
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5 changes: 2 additions & 3 deletions src/simplicial-hott/07-discrete.rzk.md
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Expand Up @@ -251,9 +251,8 @@ of discrete types is discrete.
```

By extension extensionality, an extension type into a family of discrete types
is discrete. Since `#!rzk equiv-extensions-BOT-equiv` considers total
extension types only, extending from `#!rzk BOT`, that's all we prove here for
now.
is discrete. Since `#!rzk equiv-extensions-BOT-equiv` considers total extension
types only, extending from `#!rzk BOT`, that's all we prove here for now.

```rzk
#def equiv-hom-eq-extension-type-is-discrete uses (extext)
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