The preimage of a vector is a translation of the kernel of the linear transformation

Created almost 9 years ago, updated about 8 hours ago

If $T(v_0)=w$, then the fiber $T^{-1}(\{w\})=v_0+\ker T$. Indeed $T(v)=w$ iff $T(v-v_0)=0$. A target outside the range has empty preimage. Fibers are affine translates of the kernel; only the zero fiber is necessarily a subspace.

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