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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 112<br />

✬<br />

✫<br />

Ak<strong>si</strong>omi Kolmogorova<br />

Dogodek predstavimo z mnoˇzico zanj ugodnih izidov; gotov dogodek G<br />

ustreza univerzalni mnoˇzici; nemogoč dogodek pa prazni mnoˇzici.<br />

Neprazna druˇzina dogodkov D je algebra, če velja:<br />

• A ∈ D ⇒ A ∈ D,<br />

• A, B ∈ D ⇒ A ∪ B ∈ D.<br />

Pri neskončnih mnoˇzicah dogodkov<br />

moramo drugo zahtevo posploˇ<strong>si</strong>ti<br />

• Ai ∈ D, i ∈ I ⇒ <br />

i∈I Ai ∈ D.<br />

Dobljeni strukturi rečemo σ-algebra.<br />

Univerza v Ljubljani ▲<br />

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● ❙ ▲<br />

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☛ ✖<br />

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✩<br />

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