Limits of a Sequence (Leaving Cert Mathematics): Flashcards

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Limits of a Sequence
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Convergent sequence definition

Sequence with a finite limit

Divergent sequence definition

Sequence with infinite limit or no limit

Is 1,3,5,7,...1,3,5,7,... convergent or divergent?

Divergent (limit \to \infty)

limnTn\lim_{n \to \infty} T_n for 0.3,0.33,0.333,...0.3, 0.33, 0.333,...

13\frac{1}{3} (convergent)

Is 2,2,2,2,...2,-2,2,-2,... convergent or divergent?

Divergent (no limit exists)

Sum Rule: limxa(f(x)±g(x))=\lim_{x \to a}(f(x) \pm g(x))=

limxaf(x)±limxag(x)\lim_{x \to a}f(x) \pm \lim_{x \to a}g(x)

Constant Multiple Rule: limxacf(x)=\lim_{x \to a}cf(x)=

climxaf(x)c\lim_{x \to a}f(x)

Product Rule: limxa(f(x)g(x))=\lim_{x \to a}(f(x) \cdot g(x))=

limxaf(x)limxag(x)\lim_{x \to a}f(x) \cdot \lim_{x \to a}g(x)

Quotient Rule: limxaf(x)g(x)=\lim_{x \to a}\frac{f(x)}{g(x)}=

limxaf(x)limxag(x)\frac{\lim_{x \to a}f(x)}{\lim_{x \to a}g(x)}

Constant Rule: limxac=\lim_{x \to a}c=

cc

limx1x=\lim_{x \to \infty}\frac{1}{x}=

00

limxkx\lim_{x \to \infty}k^x when 1<k<1-1<k<1

00

limxkx\lim_{x \to \infty}k^x when k>1k>1 or k<1k<-1

\infty

Is \frac{\infty}{\infty} defined?

Not defined

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