Determine if it is open/closed/neither. Prove rigorously a) { 1, n=2+ } b) { == ...

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Determine if it is open/closed/neither. Prove rigorously a) { 1, n=2+ } b) { == ₁ x = R2²+ }, IR += (0,00) c) { // ₁ nez + } U {0} d) {=2₁xER + } U{0} Determine if it is open/closed/neither. Prove rigorously a) { 1, n=2+ } b) { == ₁ x = R2²+ }, IR += (0,00) c) { // ₁ nez + } U {0} d) {=2₁xER + } U{0}

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