closure Definition and 162 Threads

How do you do this proof? Isn't it already obvious given the definition? I have no idea how to go about writing it down. :confused: If someone could help me with this, I would really appreciate it. Thanks :) Sorry I had to write it in such a messy way. Define the closure of A as A closure =...

I have already got help with figuring this out. But i seem to be getting something wrong so maybe someone can check this over and tell me what I am doing wrong Q) find the angular momentum of a cone with heigh H and radius R now i was helped and told Rc = int (x)dv / int dV...

What is a "closure type"? I first encountered it by looking at the source of the uBLAS package from boost.org -- it's essentially an implementation of the BLAS using expression templates. I noticed that a lot of the classes have a nested typedef called "closure_type" (and a...

I wrote my code and try to setup the program , desperately the program closes it so quickly return 0 or getch() commands doesn't work how can I prevent it with a code ?

Let T be an element of B[0,1] be the set V=[B[0,1];f(1)=2]. Prove that T is closed (in metric space B[0,1]). I am not sure if it is obvious since I am new to this stuff but B[0,1] is an open ball I believe. My question is how do I find the complement of V. If I could define B/T then I am...

In his opening post on Chapter Seven of Gregg Rosenberg's A Place for Consciousness, Hypnagogue says this: Now there have already been several replies to this on the original thread, and most of them seem delighted that the unwarranted claim of physicalism that nature is causally closed...

If A \subset X where X has a topology, is it generally true that the interior of A is equal to the interior of the closure of A? This seems very reasonable to me, but probably only because I'm visualizing A as a disc in the real plane. If it isn't true, what would be a counterexample? thanks

I'm not studying algebra yet, I just happened to notice this and am curious. Mathworld's entry for the field axioms doesn't include closure axioms, but I have seen other authors include closure axioms in the field axioms. Does anyone know why this is or what difference it makes? Can closure be...

1) In R3 closure of an open ball is a closed ball, but this may not hold in general metric spaces. Can somebody give an example explaining the above statement? 2) what is a separable space? some good references are welcome. thanks for your help in advance. aditya...

If A is a bounded subset of the reals, show that the points infA, supA belong to the closure A*. At first the answer seems obvious to me since A* contains its limit points. I'm just having trouble putting it into words, any suggestions would be great, thanks.

Hi everyone, I need some closure on this problem: An engineer is designing a spring to be palced at the bottom of an elevator shaft. If the elevator cable should happen to break when the elevator is at a height h above the top of the spring, calculate the value of the spring constant k so...

EDIT: forgot to say, this is in response to another thread which had wandered way off its original question. Arguably this could be in at least 3 other forums end EDIT EDIT contains some gross errors, will correct them some timeEDIT OK, just wrote a long thread on this only to hit ctrl w...