Skip to content

Section 9.9: fix .Icc 0 2 -> .Ioo 0 2 in opening 1/x examples#500

Open
rkirov wants to merge 1 commit into
teorth:mainfrom
rkirov:upstream/icc-to-ioo-9-9
Open

Section 9.9: fix .Icc 0 2 -> .Ioo 0 2 in opening 1/x examples#500
rkirov wants to merge 1 commit into
teorth:mainfrom
rkirov:upstream/icc-to-ioo-9-9

Conversation

@rkirov
Copy link
Copy Markdown
Contributor

@rkirov rkirov commented May 9, 2026

The two opening examples about 1/x use .Icc 0 2 (closed interval including 0). With Mathlib's junk-valued 1/0 = 0, the continuity claim at 0 is actually false (the limit from the right is +∞ while the value is 0), and the unboundedness claim reads oddly. The intended Tao statements are on the open interval .Ioo 0 2.

The two opening examples about `1/x` use `.Icc 0 2` (closed interval
including 0). With Mathlib's junk-valued `1/0 = 0`, the continuity claim
at `0` is actually false (the limit from the right is `+∞` while the
value is `0`), and the unboundedness claim reads oddly. The intended
Tao statements are on the open interval `.Ioo 0 2`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

1 participant