Given an arbitrary symmetric NbyN matrix A, how can its original values be calculated from $P$?
$$ P = A'A$$
Both $A$ and $P$ have \( \frac{N^2N}{2}+N \) degrees of freedom.
Edit: added the constraint that A is symmetric
Given an arbitrary symmetric NbyN matrix A, how can its original values be calculated from $P$? $$ P = A'A$$ Both $A$ and $P$ have \( \frac{N^2N}{2}+N \) degrees of freedom. Edit: added the constraint that A is symmetric 


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Well, that depends on the ground field.


