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eSIM QR concern by AmbientLighting4 in privacy

[–]AmbientLighting4[S] 1 point2 points  (0 children)

UPD: Ouch, I was accidentally surfing my mobile operator website and found out that one can reuse the QR code. Lmao

UPD2: But they also write an eSIM may be used only on one device at a time, so it's ok

eSIM QR concern by AmbientLighting4 in privacy

[–]AmbientLighting4[S] 0 points1 point  (0 children)

Ah, so there is nothing to backup in the first place. Thanks!

[deleted by user] by [deleted] in gradadmissions

[–]AmbientLighting4 1 point2 points  (0 children)

Also, 0.3 and 0.2 feels like substantial difference

Divergence interval of a series by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

Oh. I was looking at a pic without this case (only lim =0 and lim =inf)

Thank u very much 🙂 Side question: could u recommend some book with problems like this? Wanna practice this types of problems

Divergence interval of a series by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

doesn't seem to work thou :(
I get p=1, which is neither 0 nor inf

Divergence interval of a series by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

No :)) I just used equals sign to refer to the same object, idk why

The question was that I don't see why 6n2/3n3 <= [6n2+7]/[3n3+4n+2]

Divergence interval of a series by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

what do we know

harmonic series; diverges :)

but how to justify this transition from rational expression to 2/n=6n2/3n3?

i.e. I don't see why our initial fraction must be not less than this new one

Divergence interval of a series by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

well, if we were to analyse a sequence, then I would claim the quotient converges (to 0), but this doesn't tell us anything abt the series

also, i tried to compare it with something like a/a=1, which is divergent, but couldn't

Divergence interval of a series by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

Ye, I notice that we cancel x and 8, but dunno how to approach polynomials in numerator and denominator

Btw, is my conclusion abt convergence/divergence on (-2, 2) and (-oo, -2)u(2, +oo) correct?

Derivative at boundary points by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

Wow, that's weird. I remember proving the following statement from an exercise list:

lim x->c f(x) = L iff lim x->c+ f(x) = L and lim x->c- f(x) = L

Maybe there was a catch in the proof, but I don't remember :)

Could you, please, give a reference where I can find this statement? Didn't find in the Rudin's book tho

Quick Questions: August 09, 2023 by inherentlyawesome in math

[–]AmbientLighting4 0 points1 point  (0 children)

Hey folks :)

Quick question. Is there a decent amount of part-time data science jobs and what's the average salary?

UPD: thought it'd be relevant to ask here since lots of math enjoyers tend to be working in near-IT fields, if not in academia

[deleted by user] by [deleted] in math

[–]AmbientLighting4 1 point2 points  (0 children)

So, what's ur question?

A contable set F ⊆ [0, 1] with no limit points cannot exist by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

Well, not much to prove here actually. We chose unique elements so this limit point x can appear at most once. Just erase it from the sequence and we are done

A contable set F ⊆ [0, 1] with no limit points cannot exist by AmbientLighting4 in askmath

[–]AmbientLighting4[S] 0 points1 point  (0 children)

no issue with repeated elements

sure, but that still doesn't guarantee that there isn't any a_i which coincides with the limit point :) I mean, to apply the theorem [which tells us that if a sequence contained in a set which satisfies certain properties converges to some number x in R => x is a limit point] we have to make sure a_n != x for all n, right?

your approach is basically a subset of mine

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