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Invertible.md (350B)

      1 # Invertible (Matrix)
      2 
      3 Khan
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      5 **Definition:** For a matrix A to be invertible there must be another matrix B such that A * B = I and B * A = I where I is the identity matrix.
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      7 If a matrix has an invenrse then it has a unique inverse.
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      9 **Proposition:**
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     11 A linear map (matrix) is invertible iff it is injective and surjective (spans the ambient space).