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The Diagonal argument (n.) works ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠mainly to stop someone idiotically trying to list all irrationals — by a picture, which another picture could undo.