feat(Boole): add choose function declaration operator#4
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Introduces `command_choosefndef` — `function f(params) : R := ε z . pred(z, params)` — which emits an uninterpreted function declaration plus a 3-forall axiom ∀ params, ∀ z, z = f(params) → pred(z, params). Also normalises choose-assign syntax to use ε with dot separator. Depends on: strata-org/Strata#pr/choose-elab Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
command_choosefndef:function f(params) : R := ε z . pred(z, params)declares an uninterpreted function plus a 3-forall axiom∀ params, ∀ z, z = f(params) → pred(z, params)εwith dot separator (both.and::accepted)choose_operator.leantests to use the new syntax and adds choose-function test casesDependencies
Requires strata-org/Strata#pr/choose-elab to land first (DDM elaborator support).
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