4. Decide which of the following sets of vectors are subspaces of R2. Justify your answers. a₁ such that a₁ > α₂. a) The set S₂ consisting of all vectors a2 b) The set S3 consisting of all vectors c) The set S4 consisting of all vectors d) The set S₁ consisting of all vectors a₁ a2 [a] a1 a2 such that a₁ a₂ = 0. such that a₁ a₂ ≥ 0. ] such that a² + a² : = 0.

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