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mk: partitiono — split list by predicate
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(partitiono pred l yes no) — yes is the elements of l where pred
succeeds; no is the rest. Conde dispatches on each element via the
predicate goal vs nafc-of-the-predicate, threading the head through
the matching output list.

Composes with intarith / membero / etc. for any predicate-shaped goal:
  (partitiono (fn (x) (lto-i x 5)) (list 1 7 2 8 3) yes no)
    yes -> (1 2 3); no -> (7 8)

5 new tests, 496/496 cumulative.
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giles
2026-05-08 12:18:25 +00:00
parent 363ebc8f04
commit 221c7fef35
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@@ -173,6 +173,7 @@ _(none yet)_
_Newest first._
- **2026-05-08** — **partitiono**: relational partition. (partitiono pred l yes no) splits l so yes contains elements where pred succeeds and no contains the rest. Composes with intarith for numeric predicates. 5 new tests, 496/496 cumulative.
- **2026-05-08** — **appendo3**: 3-list append via two appendos. (appendo3 a b c r) is (appendo a b mid) ∧ (appendo mid c r). Recovers any of the three lists given the other two and the result. 5 new tests, 491/491 cumulative.
- **2026-05-08** — **lengtho-i**: integer-indexed length (intarith). Empty list -> 0; recurse with pluso-i. Drop-in fast replacement for Peano lengtho when the count fits in a host integer. 5 new tests, 486/486 cumulative.
- **2026-05-08** — **sumo + producto (intarith)**: fold a list of ground integers to its sum or product. Empty list -> identity (0 / 1). Recurse via pluso-i / *o-i. 9 new tests, 481/481 cumulative.