11 lines
618 B
Plaintext
11 lines
618 B
Plaintext
Solve the following problem with Lean 4 code and explanatory comments:
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```lean4
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import Mathlib
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theorem demo (n : ℕ) : n + 0 = n := by sorry
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```
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Replace every sorry statement with an appropriate proof. Before writing any Lean code, give an informal solution with the sections [Problem Restatement], [Useful Observations], [Reasoning Path], [Key Derivation], [Proof Type], [Formal Anchors] and [Final Solution]. Then provide the complete solution in the lean4 code block. If a previous attempt failed, first give [Error Analysis], [Revised Reasoning] and [Updated Proof Plan], then provide the corrected solution.
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