/sci/ - Science & Math » Thread #11326363

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Anonymous Fri 24 Jan 01:34:17 2020 No.11326363 View Reply Original Report

Quoted By: >>11326523 >>11327818

What does this notation mean?

Anonymous

Anonymous Fri 24 Jan 2020 01:40:00 No.11326379 Report

Quoted By: >>11326483 >>11326497

partial derivative of r by x keeping y constant

Anonymous

Anonymous Fri 24 Jan 2020 02:19:45 No.11326475 Report

Quoted By:

not sure what the y is doing, but for what is in the paranthesis it is read as "partial derivative of r, with respect to x"
P R O S P E R

Anonymous

Anonymous Fri 24 Jan 2020 02:25:49 No.11326483 Report

Quoted By:

>>11326379
Thank you

Anonymous

Anonymous Fri 24 Jan 2020 02:31:47 No.11326497 Report

Quoted By: >>11326541

>>11326379
what's the point?
isn't it given that anything non-x is constant?

Anonymous

Anonymous Fri 24 Jan 2020 02:44:07 No.11326523 Report

Quoted By:

>>11326363
It's just a way to show that an operation is meant to be applied to a complex expression and not any of its parts. Its basic use is to change the order of application.

Anonymous

Anonymous Fri 24 Jan 2020 02:54:26 No.11326541 Report

Quoted By: >>11326553 >>11326558

>>11326497
no. suppose you have f(x,y,z) but z=z(y). then df/dy is ambigious

Anonymous

Anonymous Fri 24 Jan 2020 03:03:29 No.11326553 Report

Quoted By:

>>11326541
>ambigious
how, if only x is changing?

Anonymous

Anonymous Fri 24 Jan 2020 03:06:31 No.11326558 Report

Quoted By:

>>11326541
wrong.

df = f_x dx + f_y dy + f_z dz

df/dy = f_x dx/dy + f_y + f_z dz/dy

Total derivative, not ambiguous at all.

Anonymous

Anonymous Fri 24 Jan 2020 03:10:30 No.11326563 Report

Quoted By: >>11326568

Okay, I'm just spitballing here, but are we only in one dimension, with variable x and constant y?
Because then it would mean dr/dx evaluated at the point y.

Anonymous

Anonymous Fri 24 Jan 2020 03:12:56 No.11326568 Report

Quoted By:

>>11326563
Yeah, OP, can we get more context? What's the problem statement?

Anonymous

Anonymous Fri 24 Jan 2020 17:59:49 No.11327818 Report

Quoted By: >>11328549

>>11326363
shouldn't it say y=some number, instead of just y?

Anonymous

Anonymous Fri 24 Jan 2020 23:18:08 No.11328549 Report

Quoted By:

>>11327818
No

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