01. Assinale a FALSA: a) Ø Ì{3}
b) {3}Ì{3}
c) Ø Ï{3}
d) 3 Î{3}
e) 3 = {3}
Alguém sabe me explicar o significado dos símbolos ( ì ) ( î ) ( Ï ) pela logica deve ser ∈ mas nunca vi isso antes
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