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Salvador Vera

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1.1. LA RECTA REAL 3<br />

Nota: Usamos paréntesis (a, b), tanto para representar el intervalo abierto (a, b), como<br />

para indicar el punto del plano de coordenadas (a, b). No obstante, el contexto determinará<br />

encadacasoaquénos estamos refiriendo.<br />

También se definen los siguientes tipos de intervalos:<br />

Intervalos semiabiertos<br />

Intervalos infinitos<br />

[a, b) ={x ∈ R/a≤ x

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