Chapters 10 and 13 - #69
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Under the current Lean/Mathlib toolchain, `simp only [..., decide_eq_true_eq, <proj-lemmas>]` no longer strips `decide P = true` to `P` when projection rfl-lemmas (`residue`/`count`/`value_add`/`weight_add`) are unfolded in the same call: `decide_eq_true_eq` is reported unused and the goal stays wrapped in `decide (…) = true`, so the following `constructor` / `calc` / `⟨_, _⟩` steps fail (no `And` constructor; `calc` type mismatch; `Eq.refl` given 2 fields). Fix: strip the `decide` in its own `simp only [_, decide_eq_true_eq]` pass first, then unfold the projections in a second step. Three sites across the two `key_fact` theorems (coin-change and knapsack). No statements changed; the whole `Fad` library builds again (8696 jobs, 0 errors). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AbkMyCwYRAiUy3NFwn9M4f
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In this pull request, we use the
TimeMmonad and systematically extends the codebase to support time complexity analysis for algorithms in Chapter 13, including Fibonacci, binomial coefficients, and the knapsack problem.Beyond that, we create the structure for Chapter 10, choosing to implement the
ThinBymulti-function as a predicate. All sections are implemented, and some exercises are suggested.