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Section 9.4: add ≤-variant as a fourth item in ContinuousWithinAt.tfae#490

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Section 9.4: add ≤-variant as a fourth item in ContinuousWithinAt.tfae#490
rkirov wants to merge 1 commit intoteorth:mainfrom
rkirov:upstream-9.4-tfae-leq

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@rkirov rkirov commented Apr 19, 2026

Tao's Proposition 9.4.7 (Exercise 9.4.1) states the ε-δ definition with both strict and non-strict inequalities. Add the non-strict variant as a fourth TFAE clause so the exercise matches the book.

Tao's Proposition 9.4.7 (Exercise 9.4.1) states the ε-δ definition with
both strict and non-strict inequalities. Add the non-strict variant as
a fourth TFAE clause so the exercise matches the book.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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