Let Sym(n) be the vector space of symmetric nⅹn matrices, and LT(n) the vector space of lower-triangular nⅹn matrices. Define F : LT(n) → Sym(n) by F(A) = ATA, where AT is the transpose of A. Show that there exists an open set U about the identity matrix in LT(n) and an open set V about the identity matrix in Sym(n), such that for each symmetric matrix B ∈ V there is a unique lower triangular matrix A ∈ U such that F(A) = B.
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