# Tagged Questions

For questions about mathematical constants, that are "significantly interesting in some way".

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### Getting from the ring of periods to the field of periods (which constant become periods in this case)?

The Ring of periods is a fascinating concept in number theory. However, it's rather restrictive, since many popular constants (such as $e$, $\gamma$) are not periods. Periods are integrals of ...
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### Finding constants with differentiation [closed]

The curve y= f(x) for which f'(x)= 4x+k, where k is a constant, has a turning point at (-2, -1). a) Find the value of k. b) Find the coordinates of the point at which the curve meets the y-axis.
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### Why do we care about the Champernowne constant?

I was browsing code golf and I came across this challenge: http://codegolf.stackexchange.com/questions/68685/the-rien-number It caught my interest and I wanted to learn a bit more about the ...
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### Constant functions periodic?

I dont understand the meaning of this line in my book - " $\sin^2x + \cos^2x$ is periodic but the fundamental period is not defined. " Why is the period not defined? $F(x)$ is $1$ here so it is a ...
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### Problem with constants in Solving first order differential equation with perturbation

$$y'+\lambda \ y^4 +y=0$$ Where $\lambda$ is very small and $y(1)=-0.5$. I've tried to solve it by Substituting: $y=y_0+\lambda y_1 +\lambda^2 y_2+\cdots$ but I had problems with the integration ...