Flashcards : Fundamental Power Series of Mathematical Functions — 12 cartes

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1Question

Exponential series — definition?

Réponse

Series for e^x converging for all real x.

2Question

Hyperbolic sine series — expansion?

Réponse

Sum of x^{2n+1}/(2n+1)! for all real x.

3Question

Hyperbolic cosine series — expansion?

Réponse

Sum of x^{2n}/(2n)! for all real x.

4Question

Trigonometric sine series — expansion?

Réponse

Sum of (-1)^n x^{2n+1}/(2n+1)! for all real x.

5Question

Trigonometric cosine series — expansion?

Réponse

Sum of (-1)^n x^{2n}/(2n)! for all real x.

6Question

Power series intervals — key?

Réponse

Convergence depends on radius and boundary points.

7Question

Logarithmic series for ln(1-x) — formula?

Réponse

-∑_{n=1}^∞ x^n/n, for x in ]-1, 1[.

8Question

Logarithmic series for ln(1+x) — formula?

Réponse

∑_{n=0}^∞ (-1)^n x^{n+1}/(n+1), for x in ]-1, 1[.

9Question

Geometric series — sum formula?

Réponse

1/(1-x) = ∑_{n=0}^∞ x^n, for |x|<1.

10Question

Alternating geometric series — formula?

Réponse

1/(1+x) = ∑_{n=0}^∞ (-1)^n x^n, for |x|<1.

11Question

Radius of convergence — meaning?

Réponse

Distance from center where series converges.

12Question

Series convergence at boundaries — note?

Réponse

Must check separately; may diverge or converge.

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1. What is the exponential series?

2. What is the power series expansion of the hyperbolic sine function, sinh(x), as given in the course content?

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