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mk: even-i / odd-i — host-arithmetic parity goals
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Two-line definitions over project + host even?/odd?. Ground-only — no
relational behaviour, but they pair cleanly with membero for filtered
enumeration:
  (fresh (x) (membero x (list 1 2 3 4 5 6)) (even-i x) (== q x))
    -> (2 4 6)

5 new tests, 416/416 cumulative.
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giles
2026-05-08 11:49:47 +00:00
parent 4d861575df
commit d992788a03
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plans/minikanren-on-sx.md
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@@ -173,6 +173,7 @@ _(none yet)_
_Newest first._
- **2026-05-08** — **even-i / odd-i (intarith)**: ground-only parity goals via project. Composes with membero for filtered enumeration: -> . 5 new tests, 416/416 cumulative.
- **2026-05-08** — **selecto**: classic miniKanren "choose an element + rest". Direct base (l = (x . rest)) plus skip-head recurse. Enumerates all (element, rest) splits in run*; runs forward, backward, mid-pipeline. 6 new tests, 411/411 cumulative.
- **2026-05-08** — **subo (contiguous sublist)**: Two appendos chained — l = front ++ s ++ back. Goal order matters: appendo on the ground l first, so the search is finitary; then constrain front. 7 new tests, 405/405 cumulative.
- **2026-05-08** — **prefixo + suffixo**: classic appendo-derived sublist relations. (prefixo p l) ≡ p ⊕ ? = l; (suffixo s l) ≡ ? ⊕ s = l. Both enumerate all prefixes/suffixes when given a fresh first arg. 9 new tests, 398/398 cumulative.