我有一個數學問題x(~急

1.Suppose v1, v2, v3, v4 is a basis of V. Prove that

v1 + v2, v2 + v3, v3 + v4, v4

is also a basis of V.

2 Suppose U and W are both 4-dimensional subspaces of C^6. Prove that

there exist two vectors in U ∩ W such that neither of these vectors is a

scalar multiple of the other.

please steps by steps

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