Am I right in the following?
a) $$∀x ∈ N: ∀y ∈ N: x + y ≥ 0$$
T
b) $$∀x ∈ Z: ∀y ∈ Z: x + y ≥ 0$$
F
c) $$∀x ∈ Z: ∃y ∈ Z: x + y ≥ 0$$
T
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3Yes, it seems everything you have written is correct. – Sarvesh Ravichandran Iyer Mar 25 '19 at 15:54