On page 63 of Hatcher's book on Algebraic Topology, he says the following:
...one says $X$ is semilocally simply-connected if this holds. To see the necessity of this condition, suppose $p : \widetilde{X} \to X$ is a covering space with $\widetilde{X}$ simply-connected. Every point $x \in X$...
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I edited some questions about physical field these days, and I found some things need to be discussed here.
(1) About field-theory, some users (mainly from Physics SE) may wrongly use this tag for questions about physical field (gravitational field, electronmagnetic field, quantum-field etc.), a...
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I edited some questions about with mathematical-physics and quantum-field-theory these days, and I'd like to share my ideas here.
(1) About field-theory, some users (mainly from Physics SE) wrongly use this tag for questions about physical field (gravitational field, electronmagnetic field, quan...
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I'm giving a talk at a postgrad seminar on the topic of topological quantum field theories (TQFTs) with a mixed audience of pure and applied mathematicians. As such, I'd like to be able to offer some applications of TQFTs within both disciplines beyond the obvious foundations in theoretical physi...
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Proposal: rename "topological-quantum-field-theory" to "topological-quantum-field-theories" and merge it with the tag "tqft"
An old question of mine recently had a couple of attempts to change the tags, which were approved (and I agree). In the process, the new tag topological-quantum-field-theo...
