06.02.2024 Views

Um Curso de Calculo - Vol

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para todo x ∈ [x 0 – d, x 0 + d]. Daí

Seja, agora,

Assim,

para todo s ∈ [x 0 – d, x 0 + d]. De e ,

e, portanto,

para todo x ∈ [x 0 – d, x 0 + d]. Logo,

M 1 ≤ KdM 1 ,

pois M 1 é o máximo de |y 1 (x) − y 2 (x)| em [x 0 – d, x 0 + d].

Se M 1 ≠ 0, resulta

1 ≤ Kd,

que contraria a escolha de d. Daí M 1 = 0. Logo,

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