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Polynomier<br />

R[x] = mængden af reelle polynomier i én variabel x.<br />

1) R[x] er et vektorrum over R:<br />

◮ p, q ∈ R[x] =⇒ p + q ∈ R[x].<br />

◮ α ∈ R, p ∈ R[x] =⇒ α · p ∈ R[x].<br />

2) R[x] er stabil overfor differentiation<br />

◮ p ∈ R[x] =⇒ p ′ ∈ R[x].<br />

3) Ethvert element p i R[x] har kun endeligt mange højere<br />

ordens afledte p, p ′ , p ′′ , p ′′′ , · · · forskellig fra 0.<br />

4) Hvad er dimensionen af vektorrummet<br />

V p = Span(p, p ′ , p ′′ , . . . )

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