Talk:Disjoint union (topology): Difference between revisions
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== Canonical injection == |
== Canonical injection == |
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Given <math>\varphi_i : X_i \to X\,</math>, the image of a point x cannot be a pair (x,i) as the latter is not an element of <math>X</math>. <small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/199.7.157.48|199.7.157.48]] ([[User talk:199.7.157.48|talk]]) 08:58, 17 September 2015 (UTC)</small><!-- Template:Unsigned IP --> <!--Autosigned by SineBot--> |
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The image of a point x cannot be a pair (x,i) as the latter is not an element of X. |
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== direct sum? == |
== direct sum? == |
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Latest revision as of 22:33, 31 January 2024
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Canonical injection
[edit]Given , the image of a point x cannot be a pair (x,i) as the latter is not an element of . — Preceding unsigned comment added by 199.7.157.48 (talk) 08:58, 17 September 2015 (UTC)
direct sum?
[edit]I thought "direct sum" implies product topology, and not the disjoint union. - Subh83 (talk | contribs) 22:39, 6 March 2012 (UTC)