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MATEMATIKA 1 Senka Banic PREDAVANJA (grupa G1): utorak i ...

MATEMATIKA 1 Senka Banic PREDAVANJA (grupa G1): utorak i ...

MATEMATIKA 1 Senka Banic PREDAVANJA (grupa G1): utorak i ...

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Neka su A; B 6= ? proizvoljni neprazni skupovi, tea 2 A i b 2 B.Objekt (a; b) nazivamo ure ¯denim parom, pri cemuje a prvi clan (prva koordinata) ure ¯denog para, a bdrugi clan (druga koordinata) ure ¯denog para (a; b):Poredak clanova u ure ¯denom paru je vaan!!!Vrijedi(a; b) = (c; d) () (a = c ^ b = d) :Dakle,(a; b) 6= (b; a) za a 6= b;(a; b) = (b; a) () a = b:Za razliku od toga za "obicni" dvoclani skup (par, aline ure ¯deni) vrijedifa; bg = fb; agtj. nije bitan poredak elemenata u tom skupu.Kartezijev (ili direktni) produkt skupova:A B = f(a; b) j a 2 A ^ b 2 Bg :A ? = ? B = ?A B 6= B A

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