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Opora I - Pf UJEP

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) M je systém množin {a, b}, { a, b, c}, { a, b, d }, { a, b, c, d}<br />

M = {{a, b}, { a, b, c}, { a, b, d }, { a, b, c, d} }<br />

x R y označíme vztah x ⊂ y (čteme : x je podmnožina y )<br />

Lehce se přesvědčíme, že informace 1) až 4) jsou pravdivé.<br />

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