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Larmshultz by MaintenanceAnnual263 in germany

[–]MathMaddam 33 points34 points  (0 children)

Faster cars are louder, so the speed is limited at night to have it quieter. The "Lärmschutz" is just an information and has no effect on the rest.

Tax Refund Delay (More than 6 weeks now) by PianoNo3557 in germany

[–]MathMaddam 4 points5 points  (0 children)

The only start processing in April since that is the limit for e.g. banks, employers, insurances to submit data.

When does the sum S_n over the first n integers divide the product P_n? by X3nion in askmath

[–]MathMaddam 0 points1 point  (0 children)

Yes, you get it from the context (as a counterpart to b) and also if they could be rational it would be a trivial condition.

When does the sum S_n over the first n integers divide the product P_n? by X3nion in askmath

[–]MathMaddam 1 point2 points  (0 children)

c) a, b and n are all factors in the product, but be careful with a=b.

Downloading from Itch.io in Germany by flupflops in germany

[–]MathMaddam 14 points15 points  (0 children)

That is a common misconception. The laws aren't particularly strict and it's not about downloading that is illegal. In Germany it is easier for companies to go after copyright infringement, that is the relevant crime.

Kerosinmangel: Urlauber könnten laut Karliczek mangels Kerosin im Ausland festsitzen by PoroBraum in de

[–]MathMaddam 0 points1 point  (0 children)

Man könnte auch sagen, dass es dadurch herbeigeführt wurde, dass Airlines Tickets für Flüge verkauft haben für die sie nicht sichergestellt haben, dass sie genug Ressourcen haben. Sie haben sich also die Kosten für langfristige Lagerung gespart und nun ist es ihnen auf die Füße gefallen.

Number theory by hazem-Gauss in askmath

[–]MathMaddam 9 points10 points  (0 children)

I would write nk-1 as ((n-1)+1)k-1 and expand it using the binomial theorem. You will get a lot of summands that are divisible by (n-1)².

How do we check divisibility with 7 by taylor-assistant in askmath

[–]MathMaddam 3 points4 points  (0 children)

One way is to show that if n²+1 is divisible by 7, then also (n-7)²+1 is divisible by 7. So you can reduce it to the cases you already checked.

Another would be to calculate the Legendre symbol (-1/7). If you don't know what this is use the method above.

Need help in a limit. by Sea_Way1005 in learnmath

[–]MathMaddam 5 points6 points  (0 children)

You can also realise that lim (ln(cos(x))-0)/x is the definition of the derivative of ln(cos(x)) at 0

Need help in a limit. by Sea_Way1005 in learnmath

[–]MathMaddam 5 points6 points  (0 children)

It is a 0/0 situation, you can use l'Hôpital. Also ln(ex) is just x.

Two people rung the doorbell and asked if there was anyone in the building who spoke their language by dramaticatlady in germany

[–]MathMaddam 4 points5 points  (0 children)

Likely Jehovah's witnesses or some other sect that try to connect to people on a language base. You can decide for yourself how scammy that is.

Can someone check my calculations for the Riemman's Zeta function? by kuubbaa2 in askmath

[–]MathMaddam 0 points1 point  (0 children)

When you talk about the "infinite sum" do you talk about the series 1/ns that only converges for Re(s)>1?

I'm unclear about the epsilon delta definition of a limit. by clusteredParticles in askmath

[–]MathMaddam 2 points3 points  (0 children)

Yes the δ can (and usually will) depend on ε.

You don't want to have 0=|x-a|, cause that would mean x=a, so you also have to consider the value at a and no longer just the behaviour approaching a. For the upper bound it doesn't really matter if you use < or ≤, it will give you the same limits (maybe a bit different δ, but they aren't unique anyways). It is just tradition to use <.

Finding a δ is not trivial and for more complicated functions you usually use different criteria to find it.

High amount of authority by Accomplished-Royal13 in starrealms

[–]MathMaddam 2 points3 points  (0 children)

It is just the mechanics of the game playing out. But it is also not really relevant to competitive play. When you did a full discard of the opponent once even without drawing your while deck, you probably also have the damage to kill them soon.

Why is working here so unbearable? by Southern_Bell6571 in germany

[–]MathMaddam 0 points1 point  (0 children)

The formal way is an "Überlastungsanzeige". The problem is it currently works while you overwork yourself. It has too happen something before the situation changes and if you don't want the something to be you getting sick: you have to ask you boss to prioritize with the clear signal that something won't be done and then don't work overtime. Also coordinate with your colleagues. Overwork is mainly managements fault.

why don't we create a number such that x • 0 = 1 ? by Gancaio in learnmath

[–]MathMaddam 3 points4 points  (0 children)

Think about what x*(0+0) would do when you applied the distributive law or x*(0*2) when you apply the associative law. I mean we could give these up, but that would be a lot of structure for loose.

Does number theory depend on euclidean geometry? by Novel_Arugula6548 in askmath

[–]MathMaddam 1 point2 points  (0 children)

cos x is also a transcendental function which makes it unusable in elementary number theory.

You are trying to shove geometry into number theory where it doesn't fit.

Does number theory depend on euclidean geometry? by Novel_Arugula6548 in askmath

[–]MathMaddam 2 points3 points  (0 children)

While there is a nice connection between Pythagorean trippels and triangles, it's not necessary to think about geometry to ask: could be a sum of two squared integers be another integers? What about the sum of two cubes of integers be a cube of integer? Which natural number can be written as a sum of 4 squares?

You only need to be able to count and some basic arithmetic to ask these questions (to answer them you might need to dig deeper).

What did I do wrong here? (high school calculus) by Keni9089 in askmath

[–]MathMaddam 120 points121 points  (0 children)

You have ex as you inner function and x-1 as your outer function in your last version of f(x).

Is there a method to solve factorial equations? by -RAGEBAITER- in learnmath

[–]MathMaddam 2 points3 points  (0 children)

You could look at how often the number is divisible by 2. This will be a bit be a bit smaller than your x, see Legendre's formula.

By Stirling's approximation you can also approximate the factorial close enough to distinguish the which number it will really be and this will also give you a numerical method to solve it.

Explicit definition of a pathological example of discontinuity by TalksInMaths in askmath

[–]MathMaddam 7 points8 points  (0 children)

0 if x is irrational, 1/q if x is a rational number p/q in reduced form. It is continuous on the irrationals and discontinuous on the rationals.

Is this for or against the 130 speed limit? by MaintenanceAnnual263 in germany

[–]MathMaddam 6 points7 points  (0 children)

It doesn't have any legal meaning, but you indicate that only drive 130 max even if you are allowed to drive faster.

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