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Compactification (mathematics) In mathematics, in general topology, compactification is the process or result of making a topological space into a compact space. [1] A compact space is a space in which every open cover of the space contains a finite subcover. The methods of compactification are various, but each is a way of controlling points ...
X is homotopy equivalent to a one-point space. X deformation retracts onto a point. (However, there exist contractible spaces which do not strongly deformation retract to a point.) For any path-connected space Y, any two maps f,g: X → Y are homotopic. For any space Y, any map f: Y → X is null-homotopic. The cone on a space X is always ...
Whether you’re listening to your favorite tunes or trying to have a meeting for work, there are some things to know about wearing earbuds while driving in Georgia.
Eat hydrating fruits and veggies. Some hydrating fruits and vegetables can perform multiple jobs here. Leafy greens (like spinach), veggies (such as cabbage and zucchini) as well as berries (like ...
Here are her tried-and-true tips after 25 years as a professional traveler: Avoid caffeine: Brown recommends turning down the in-flight coffee service so that the caffeine doesn't keep you up ...
Interstellar travel is the hypothetical travel of spacecraft from one star system, solitary star, or planetary system to another. Interstellar travel is expected to prove much more difficult than interplanetary spaceflight due to the vast difference in the scale of the involved distances. Whereas the distance between any two planets in the ...
In early June, Toyota announced the recall of nearly 100,000 Tundra pickups and about 3,500 Lexus luxury SUVs to fix a problem that could cause their engines to lose power while driving.
Record summer air travel demand isn’t translating to record U.S. airline profits. Carriers will have to answer for that disconnect when they report quarterly results this month. Some airlines ...