# Limits of infinite series and lightbulbs

**URL:** <https://boards.straightdope.com/t/limits-of-infinite-series-and-lightbulbs/128659>\
**Category:** Factual Questions\
**Created:** [September 16, 2002, 8:17am UTC](https://boards.straightdope.com/t/limits-of-infinite-series-and-lightbulbs/128659 "2002-09-16T08:17:13Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![ultrafilter](https://avatars.discourse-cdn.com/v4/letter/u/3d9bf3/32.png) [@ultrafilter](https://boards.straightdope.com/u/ultrafilter)\
**Post date:** [September 21, 2002, 1:16am UTC](https://boards.straightdope.com/t/limits-of-infinite-series-and-lightbulbs/128659/22 "2002-09-21T01:16:40Z")

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The system is self-contradictory. Theoretically, it can’t exist.

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**Author:** ![Achernar](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@Achernar](https://boards.straightdope.com/u/Achernar)\
**Post date:** [September 21, 2002, 6:01am UTC](https://boards.straightdope.com/t/limits-of-infinite-series-and-lightbulbs/128659/23 "2002-09-21T06:01:34Z")

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**Hari Seldon** , would you mind explaining your ladder paradox some more? I don’t get that the bottom of the ladder is moving at infinite speed; I get that it’s moving at speed 0.

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