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Solvability
Simplifying Assumptions
The solvability of the system must fall into one of three cases:
The system may not admit any solutions
The system may admit a single solution
The system may admit infinitely many solutions
no wide matrix system admits a unique solution.
every tall matrix A admits systems A~x =~b0 that are not solvable.
nonsingularity: 非奇异性/非退化的
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