Diferenta simetrica

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sigma
Arhimede
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Joined: Wed Nov 19, 2008 9:03 pm

Diferenta simetrica

Post by sigma »

Dovediti ca pentru orice trei multimi \( A,B,C \) are loc egalitatea : \( (A\Delta B)\Delta C=A\Delta (B\Delta C) \) , unde \( \Delta \) este diferenta simetrica .
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