New year, new tag management thread.
Rules of the game are basically the same:
Post your suggestion as an answer here if you see
A particularly bad tag (a rule of thumb: “if I can't imagine a person classifying a tag as either interesting or ignored, I'm getting rid of it”),
A tag that should b...2
Resolved: Both tags renamed.
Proposal: Rename matrixpencil to matrix-pencil, lyndonwords to lyndon-words
Nothing too crazy here, just some quick grammar fixes.
In mathematics, the dot product or scalar product is an algebraic operation that takes two equal-length sequences of numbers (usually coordinate vectors), and returns a single number. In Euclidean geometry, the dot product of the Cartesian coordinates of two vectors is widely used. It is often called "the" inner product (or rarely projection product) of Euclidean space, even though it is not the only inner product that can be defined on Euclidean space (see Inner product space for more).
Algebraically, the dot product is the sum of the products of the corresponding entries of the two sequences...
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I'm struggling with a problem about determining if an Uncountable Fort Space is Tychonoff or not, at this moment I have proven that my space is regular Hausdorff but I can't find a Urysohn Function for the space in question.
Any hint or tip is welcome :)
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Q: Suppose that X is a compact Hausdorff space. Show that if A ⊆ X is compact, then A is closed in X.
Suppose that X is a compact Hausdorff space. Show that if A ⊆ X is compact, then
A is closed in X.
How to prove that a compact set $K$ in a Hausdorff topological space $\mathbb{X}$ is closed? I seek a proof that is as self contained as possible.
Thank you.
