This means that the zero vector (0, 0, 0, 0) is in S.
2) S must be closed under addition:
Let's take two vectors (T1, T2, T3, x4) and (T1', T2', T3', x4') in S. We need to show that their sum is also in S.
(T1, T2, T3, x4) + (T1', T2', T3', x4') = (T1 + T1', T2
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