Timeline for Can it be represented by convolution and multiplication
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Mar 14, 2021 at 1:14 | history | edited | Iosif Pinelis |
edited tags
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| Mar 11, 2021 at 12:08 | history | edited | gmvh |
(Re-)added top-level tag (each question should carry a top-level tag)
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| Mar 11, 2021 at 11:52 | vote | accept | J.G. Kang | ||
| Mar 11, 2021 at 11:43 | comment | added | J.G. Kang | @IosifPinelis I have changed the notation :) | |
| Mar 11, 2021 at 11:37 | history | edited | J.G. Kang | CC BY-SA 4.0 |
one more example and notation is changed
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| Mar 10, 2021 at 15:05 | comment | added | Iosif Pinelis | @LSpice : (i) I have certainly seen expressions such as "function $f(x)$", especially in older papers. (ii) In your example, the "correct" expression is indeed horrible, whereas the expression $\frac d{dx}(x^2)$ is not really objectionable at all, since it is easy and natural to attach a meaning to the derivative of an expression (rather than of a function). (iii) In my suggestions, in contrast with that example, the correct versions are, not only not horrible, but they are also neater, more compact, and easier to understand than the incorrect ones, especially $B(t)*F(t)$ vs. $(B*F)(t)$. | |
| Mar 10, 2021 at 14:48 | comment | added | LSpice | @IosifPinelis, while I certainly agree with you about what usage is proper, I think that the usage in the parent post is so familiar that, while technically improper, it is not really any more objectionable than writing $\frac{\mathrm d}{\mathrm dx}(x^2)$ instead of something like the more technically correct but horrible $\bigl(D(x \mapsto x^2)\bigr)(x)$. Certainly I have seen the notation in the post used by mathematicians wiser and abler than I. | |
| Mar 10, 2021 at 14:44 | comment | added | Iosif Pinelis | Do not write "functions $B(x), F(x), S(x)$ that are zero for $x<0$" -- write "functions $B,F,S$ that are zero on $(-\infty,0)$" instead. Do not write $B(t)*F(t)$ --write $(B*F)(t)$ instead. | |
| Mar 10, 2021 at 14:40 | answer | added | Iosif Pinelis | timeline score: 3 | |
| Mar 10, 2021 at 7:24 | history | edited | gmvh | CC BY-SA 4.0 |
Minor copyediting, added top-level tag
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| Mar 10, 2021 at 6:40 | review | First posts | |||
| Mar 10, 2021 at 6:57 | |||||
| Mar 10, 2021 at 6:36 | history | asked | J.G. Kang | CC BY-SA 4.0 |