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seen Nov 21 at 2:33

Aug
19
comment Integrating a Dirac delta function with the argument dependent of a parameter
Suppose that $x(t) = D$ once over the interval of integration. Now, suppose that $x(t) = D$ n times over the interval. But, now suppose that $x(t) = D$ over a continuous subset of the interval...
Apr
15
comment Is there any distinction between these products: scalar, dot, inner?
@garyp, this is the section I recall from Schutz: books.google.com/…
Apr
15
comment Is there any distinction between these products: scalar, dot, inner?
@garyp, without a metric, there is no mapping between $\vec A$ and $\tilde A$. So, while $\tilde A(\vec B)$ exists, $\vec A \cdot \vec B$ does not.
Apr
14
comment Is there any distinction between these products: scalar, dot, inner?
@jinawee, correct, $\mathbf g(\vec A,) = \tilde A$
Apr
14
comment Is there any distinction between these products: scalar, dot, inner?
I believe I read in Schutz that the contraction of a vector and co-vector (one-form), $\tilde p(\vec A)$ does not require the intervention of a metric whereas the dot product of two vectors $\vec A \cdot \vec B = \mathbf g(\vec A, \vec B) = \tilde A(\vec B) $ does
Dec
9
awarded  Yearling
Nov
19
answered Prime notation in integral?
Nov
19
comment Prime notation in integral?
See: mathworld.wolfram.com/DummyVariable.html
Nov
12
answered The Concept of Instantaneous Velocity
Oct
18
answered How can I find the value of $\ln( |x|)$ without using the calculator?
Oct
7
awarded  Supporter
Sep
20
comment The inverse Fourier transform of $1$ is Dirac's Delta
@Vibert, I've edited my answer to reflect your suggestion.
Sep
20
answered The inverse Fourier transform of $1$ is Dirac's Delta
Jul
18
awarded  Teacher
Jul
18
answered Proof: For all integers $x$ and $y$, if $x^3+x = y^3+y$ then $x = y$