vonjd
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 May12 comment Difference between metric and norm made concrete: The case of Euclid @user6312: Thank you - could you please give an example of a simple metric that is not translation invariant? May12 asked Difference between metric and norm made concrete: The case of Euclid May12 accepted Connections between metrics, norms and scalar products (for understanding e.g. Banach and Hilbert spaces) May11 comment Connections between metrics, norms and scalar products (for understanding e.g. Banach and Hilbert spaces) @Theo: This one is interesting: Could you give an intuitive example of a metric where you don't have a norm? Perhaps I am not thinking abstractly enough but if you can define the distance of a vector from the origin you must also be able to measure the length between two points defined by vectors, or not?!? May11 asked Connections between metrics, norms and scalar products (for understanding e.g. Banach and Hilbert spaces) Apr17 accepted Why is the ratio test for $L=1$ inconclusive? Apr17 asked Why is the ratio test for $L=1$ inconclusive? Apr11 accepted How to solve combinations of differentials and integrals? Apr11 comment How to solve combinations of differentials and integrals? Thank you - esp. the section "variable limits" is relevant. Apr11 comment How to solve combinations of differentials and integrals? Thank you! Why do you have an extra term in (b) and two extra terms in (c)? Because you have to differentiate acc. to the boundaries of the integral? But in (a) you also have boundaries (- to + infinity)??? Apr11 asked How to solve combinations of differentials and integrals? Apr5 accepted Connection between chain rule, u-substitution and Riemann-Stieltjes integral Apr5 comment Connection between chain rule, u-substitution and Riemann-Stieltjes integral Thank you for this very enlightening answer! Apr5 comment Connection between chain rule, u-substitution and Riemann-Stieltjes integral @lhf: Thank you, I found that already - I think it gives only part of the answer and not the big picture. Apr5 asked Connection between chain rule, u-substitution and Riemann-Stieltjes integral Apr5 answered Function example? Continuous everywhere, differentiable nowhere Mar30 awarded Taxonomist Mar27 awarded Quorum Mar7 answered Introductory Group theory textbook Feb11 accepted Is the complex exponential function injective, surjective and/or bijective - and why?