Recent content by Tokipin

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    Undergrad Symbolize Absence of evidence is not evidence of absence

    Could the likes of Doxastic logic be usable here? I'm not really familiar with formal logic, just throwing this out.
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    Graduate Diagrammatic Tensor Notation from the Beginning

    I really like these! UML might give you some ideas.
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    Convergence of Rational Sequences in Subspaces

    Thanks Dick, Cauchy + Completeness clarified it. I noticed that the problems in this book reference things from all over the place. And many thanks Ivy for taking the time to set everything straight. Very appreciated!
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    Convergence of Rational Sequences in Subspaces

    Homework Statement From Introduction to Topology by Bert Mendelson, Chapter 2.7, Exercise 8: Consider the subspace (Q, d_Q) (the rational numbers) of (R, d). Let a1, a2, ... be a sequence of rational numbers such that \lim_{n} a_n = \sqrt{2}. Does the sequence converge when considered...
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    Graduate Resource/reference for particle interactions?

    Thanks! That's exactly the kind of resource I'm interested in.
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    Graduate Resource/reference for particle interactions?

    Is there a collection somewhere of particle interaction descriptions? For example, if I'm wondering what an electron-positron interaction does, what website can I type "electron positron" into and get back a handful of Feynman diagrams of relevant interactions? If that's too idealistic, is...
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    LaTeX Create Math Diagrams in LaTeX: Does TeX Have Diagram Package?

    Thanks for the recommendations. Is it possible to make an angled arrow? I think I'll stick to CorelDraw for the time being. I could probably make a simple SVG-to-picture converter program, but I'm not sure how much it's worth the trouble. Actually there are obviously LaTeX picture...
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    LaTeX Create Math Diagrams in LaTeX: Does TeX Have Diagram Package?

    I mean diagrams like this:
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    LaTeX Create Math Diagrams in LaTeX: Does TeX Have Diagram Package?

    Does the TeX install here have a diagram package? For diagrams like commutative diagrams. It would be nice.
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    Can Continuity Guarantee a Minimum Value on an Interval?

    Thanks for looking it over!
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    Can Continuity Guarantee a Minimum Value on an Interval?

    Homework Statement From Introduction to Topology by Bert Mendelson, Chapter 2.4, Exercise 8: Let R be the real numbers and f: R -> R a continuous function. Suppose that for some number a \in R, f(a) > 0. Prove that there is a positive number k and a closed interval F = [a - \delta, a +...
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    Neighborhood Proof for Distinct Points in a Metric Space

    That's hilarious. I was thinking that if we define an open ball of radius d(a,b)/2 about each point, then the neighborhoods wouldn't intersect. But I wasn't sure I could generalize this from R^2. Thanks. Here's an attempt at a proof: About each point a and b, define an open ball of radius...
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    Neighborhood Proof for Distinct Points in a Metric Space

    Homework Statement From Introduction to Topology by Bert Mendelson, Chapter 2.4, Exercise 6: Let a and b be distinct points of a metric space X. Prove that there are neighborhoods N_a and N_b of a and b respectively such that N_a \cap N_b = \varnothing. 2. The attempt at a solution OK...
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    MATLAB Creating a unit step function in Matlab

    I think recent versions of Matlab come with the function under the name heaviside (i.e. Heaviside step function.)
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    Confusion with Continuity Definition

    O.k., so the epsilon is a "for all" variable? If so then that's what I misunderstood. Thanks.