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練習問題案： <code>List.last</code> を手作りして基本的な性質をしめす

Status: Open.

#2244 In lean-ja/lean-by-example;

· Seasawher opened on Dec 30, 2025

<code>try?</code> を紹介する

タクティク

Status: Open.

#2243 In lean-ja/lean-by-example;

· Seasawher opened on Dec 30, 2025

入れ子帰納型(nested inductive type)を紹介する

宣言的コマンド

Status: Open.

#2241 In lean-ja/lean-by-example;

· Seasawher opened on Dec 30, 2025

match 用に専用のラッパーを作る例 (match 式の融通の利かなさを何とかする例)

Status: Open.

#2239 In lean-ja/lean-by-example;

· Seasawher opened on Dec 27, 2025

証明付きプログラムの例: 文字列の長さが max を超えないように末尾を切り落とし、末尾を msg で置き換える

Status: Open.

#2238 In lean-ja/lean-by-example;

· Seasawher opened on Dec 22, 2025

依存型使用例。空白を含まない文字列

Status: Open.

#2236 In lean-ja/lean-by-example;

· Seasawher opened on Dec 19, 2025

WellFoundedだとdecideできない例

Status: Open.

#2235 In lean-ja/lean-by-example;

· Seasawher opened on Dec 19, 2025

練習問題案。LeetCodeの基本問題をやる

Playground

Status: Open.

#2234 In lean-ja/lean-by-example;

· Seasawher opened on Dec 18, 2025

練習問題案。オランダの国旗問題

Playground

Status: Open.

#2233 In lean-ja/lean-by-example;

· Seasawher opened on Dec 17, 2025

ソートの安定性をどう表現するのか？

Playground

Status: Open.

#2232 In lean-ja/lean-by-example;

· Seasawher opened on Dec 17, 2025

<code>termination_by</code> が必要な例：

Status: Open.

#2231 In lean-ja/lean-by-example;

· Seasawher opened on Dec 16, 2025

fold 系の使用例: min と max

Status: Open.

#2230 In lean-ja/lean-by-example;

· Seasawher opened on Dec 16, 2025