# Topospaces:Error log

From Topospaces

Did you find something that looks like an error (or possible error) to you? Report the error quickly here (anonymous, does *not* require login, but you can optionally provide an email ID to be notified of the fix).

We have just started logging errors. On this page, you will find information about all errors that persisted on the site for more than one month on any page. Note: This applies only to errors that were not fixed by December 18, 2011. Errors fixed before then are not being logged on this page.

Page | Error description | Version where it was introduced | Version where it was corrected | Why error? Why not caught? ("I" refers to Vipul) |
---|---|---|---|---|

Space of path components | Incorrect statement that induced multiplication on space of path components gives a topological monoid structure; in fact it need not be continuous | December 20, 2010 | July 6, 2019 | genuine conceptual confusion |

Compact times paracompact implies paracompact | General sloppiness in proof, missed some inclusion conditions | June 3, 2017 | Additional conditions were implicit when reading; carelessness in review | |

Homotopy type of connected sum depends on choice of gluing map | Excluded one relation from cohomology ring description | July 29, 2011 | December 15, 2016 | Ignored interaction term in analysis |

Connected sum of two complex projective planes with opposite orientation | Excluded one relation from cohomology ring description | July 29, 2011 | December 15, 2016 | Ignored interaction term in analysis |

Connected sum of two complex projective planes with same orientation | Excluded one relation from cohomology ring description | July 29, 2011 | December 13, 2016 | Ignored interaction term in analysis |

Paracompact Hausdorff implies normal | Used instead of at one place | May 30, 2016 | Didn't proofread carefully | |

Locally path-connected space | Incorrectly said it is obtained by applying the locally operator | May 30, 2016 | Multiple definitions of "locally" floating around | |

Homotopy of spheres, homotopy of real projective space, homotopy of complex projective space | Stated that some groups are when all we know is that sometimes they are infinite. | April 2016 | Difficult topic, basically just guesswork/poor sourcing | |

Hausdorffization | provided incorrect definition that seemed prima facie plausible |
November 15, 2015 | genuine knowledge gap, common confusion | |

Weak homotopy equivalence of topological spaces | provided incorrect definition in the form of "induces isomorphisms on and on homology" | November 18, 2013 | genuine knowledge gap, common confusion. | |

Double mapping cylinder | wrote instead of . | November 2, 2007 | February 11, 2014 | Typo, didn't proofread. |

Manifold | mistakenly wrote "equivalent" for a bunch of conditions all of which need to be satisfied. | November 2, 2014 | Typo, didn't proofread. | |

Jointly continuous map | typo: wrote that slice topology is finer than slice topology, meant it is finer than product topology | December 20, 2010 | May 15, 2015 | Typo, didn't proofread, and didn't revisit the page. |