Recent content by cogito²

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    Relationship between Chern and Levi-Civita Connections on Kahler Manifolds

    I have thought about this some more and have become convinced that the following identification is correct: Let X be a complex manifold and (TX,J) be the real tangent space with canonical complex structure. Then (TX,J) is isomorphic to the holomorphic tangent bundle (T_X, i) where the...
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    Relationship between Chern and Levi-Civita Connections on Kahler Manifolds

    So I'm trying to understand the statement: On a complex manifold with a hermitian metric the Levi-Civita connection on the real tangent space and the Chern connection on the holomorphic tangent space coincide iff the metric is Kahler. I basically understand the meaning of this statement, but...
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    Characterization of paracompactness

    Yeah well I'm not sure the last time I considered a partition of unity on a non-Hausdorff space so I'll probably be okay...
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    Characterization of paracompactness

    I just take the definition of paracompact to mean there exists a partition of unity...
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    A question of the complete metric space

    The space of continuous functions is complete with respect to the second distance function. But what you're trying to show is that the space of continuously differentiable functions is not complete with respect to that norm. Since every continuously differentiable function is continuous, you...
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    A question of the complete metric space

    For the counterexample, can you come up with a sequence of differentiable functions that converges to a non-differentiable function? Hint: Choose a very simple function that's continuous, but not differentiable.
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    Another implememntation of van Kampen thoerem.

    If X_1,X_2 are simply-connected, then by definition \pi_1(X_1) = \pi_1(X_2) = 0 which certainly will cause difficulties if you're trying to prove they are isomorphic to Z.
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    Geometric meaning of Mean Value Theorem

    Yet another even more geometric way of looking at it would be just straight integrate your unknown function and the "average" function. If you assume (like my last post) that f' is always less than the average or always greater than the average, then the integrals of the f and the average...
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    Geometric meaning of Mean Value Theorem

    Another way of thinking about it is this. Let's say that there were some function f (that fulfills all necessary requirements for MVT to hold) such that MVT didn't hold. Then since f' is continuous (or assume that if that isn't in the hypotheses, since it's always true in "normal" phenomena), it...
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    Local path-connectedness v. path-connectedness

    That's a pretty nice example of such a space. Well I guess it's time to fine-tune my intuition...
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    Local path-connectedness v. path-connectedness

    My first time around google didn't bring me to this site which claims to contradict my intuition. So I guess this thread can be ignored...
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    Local path-connectedness v. path-connectedness

    Can a space be path-connected and not locally path-connected? (To be clear, "locally path-connected" just means that there is a basis of path-connected of sets.) My general intuition says no, but my intuition seems to usually be wrong...and this would explain why Hatcher keeps referring to...
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    Lim (n→∞)((-1)^n)/n: Does it Converge or Diverge?

    Are you asking if this converges: \lim_{n \to \infty} \frac{(-1)^n}{n} Look at the first few terms: \frac{-1}{1}, \frac{1}{2}, \frac{-1}{3}, \frac{1}{4}, \ldots Do those numbers tend to get close to something? Other people here seem to ask if you're wondering if this converges...
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    Is R a Finite-Dimensional Vector Space Over Q?

    Another similar question might be: Can anyone come up with an explicit Hamel basis of an infinite dimensional (separable) Hilbert space? I don't think it's possible (in most meanings of "explicit"). I mean basically the reason you throw analysis into separable infinite dimensional Hilbert spaces...
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    Is Idempotent Equivalence in Rings Transitive?

    Alright that's about as complicated as I expected it to be...I basically had that written down, but apparently I don't quite have a fully functioning brain and for some reason couldn't see it. Many thanks.
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