`SSG/Core.lean`

Explanation legend Lean4 Domain Explanation Language (L4DEL)

L4DEL explanations are a separate layer. They do not change the Lean source. Intuition is explanatory prose; numbered items are a reading path; sources link the wording back to evidence.

L4DEL: Lean4 Domain Explanation Language

Annotation provenance. This overlay contains 8 curated AI-written annotations and 3305 mechanical source-derived annotations. They have not been human-reviewed as explanations; treat them as unverified and not mathematical authority. Retained generation history: The 71 original curated annotations were produced in a Claude Sonnet 5.5 session at medium effort; Claude Opus 5.5 is recorded in that session as the advisor model, not the direct author. The bulk source-derived expansion was generated mechanically from pinned source comments by tooling developed in a GPT-5.6 Sol session at ultra reasoning; GPT-5.6 Sol did not originate the quoted source prose. On 2026-10-17 the mechanically generated source-comment annotations of the Formal Conjectures, Carleson, FLT, PFR, CompFiles, Mathematics in Lean and Theorem Proving in Lean overlays were regenerated by the same generator after three corrections made in a Claude Sonnet 5.5 session: titles no longer cut a sentence inside mathematics or end on a dangling word, workflow markers are removed from the quoted prose, and declaration names follow the scanner's namespace resolution. The boilerplate step line was dropped, and comments that were only a row of dashes no longer yield annotations. No new prose was written and no human review is claimed.

Credit: The upstream authors and contributors retain credit for the project and mathematics. lean4-explainer only renders their pinned source and adds the separately disclosed explanation layer.

Project sources: Pinned compfiles documentation, Pinned compfiles corpus index

12 declarations, 0 contain sorry, 0 declared as axioms

Core types and abstractions for the SSG

Imported by 7 files

structure Page A page to be generated line 8 source
Source documentation
A page to be generated

no axioms what this means
```
structure Page where
…
```
def Page.static Helper: create a page from static content line 18 source
Source documentation
Helper: create a page from static content

no axioms what this means
Statement uses: String, Page
Proof uses: Page.mk, Pure.pure, IO, IO.Error
3 instances, coercions and auxiliary constants left out.
```
def static (path : String) (content : String) : Page :=
…
```
Mentions: Page
def Page.dynamic Helper: create a page from IO action line 22 source
Source documentation
Helper: create a page from IO action

no axioms what this means
Statement uses: String, IO, Page
Proof uses: Page.mk
```
def dynamic (path : String) (gen : IO String) : Page :=
…
```
Mentions: Page
inductive Asset A static asset to be copied line 28 source
Source documentation
A static asset to be copied

no axioms what this means
```
inductive Asset where
…
```
def Asset.src line 35 source
no axioms what this means
Statement uses: Asset, String
Proof uses: Asset.src.match_1
def Asset.dst line 39 source
no axioms what this means
Statement uses: Asset, String
Proof uses: Asset.src.match_1
structure SiteConfig Site-wide configuration line 46 source
Source documentation
Site-wide configuration

no axioms what this means
Statement uses: ToString
```
structure SiteConfig (Custom : Type) [ToString Custom] where
…
```
instance SiteConfig.(instance at line 61) line 61 source
def SiteConfig.resolveRel line 69 source
standard axioms: propext what this means
Statement uses: ToString, SiteConfig, List, String
Proof uses: HAppend.hAppend, SiteConfig.pathPrefix, String.intercalate, List.filter, Decidable.decide, Not, Eq, Bool, String.isEmpty, Bool.true
5 instances, coercions and auxiliary constants left out.
def SiteConfig.resolveAbs line 73 source
standard axioms: propext what this means
Statement uses: ToString, SiteConfig, List, String
Proof uses: HAppend.hAppend, SiteConfig.baseUrl, SiteConfig.resolveRel
2 instances, coercions and auxiliary constants left out.
def SiteConfig.resolveAsset line 76 source
standard axioms: Classical.choice, Quot.sound, propext what this means
Statement uses: ToString, SiteConfig, Asset, String
Proof uses: SiteConfig.resolveAbs, Std.Iter.toList, Std.Iterators.Types.FilterMap, Std.Iterators.Types.Map, String.Slice.SplitIterator, String.Slice.Pattern.ForwardSliceSearcher, String.toSlice, Asset.dst, String.Slice.Subslice, String.Slice, Id, MonadLiftT.monadLift, Pure.pure, Std.Iterators.PostconditionT, String.Slice.Subslice.toSlice, Option, ite, Not, Eq, Bool and 7 more
13 instances, coercions and auxiliary constants left out.
abbrev PageGenerator Page generator: takes data and produces pages line 83 source
Source documentation
Page generator: takes data and produces pages

no axioms what this means
Proof uses: IO, List, Page
```
abbrev PageGenerator α := α → IO (List Page)
```
Mentions: Page