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Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 341 / 2 / b / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2021 iii Paper 341 2 b
2026-09-29  0 By others on same topic  0 Discussions Create my own version
Algebraic stability requires bi​≥0 and positive semidefiniteness of
M=BA+ATB−bbT,B=diag(b).
(1)
The three weights are positive, but direct calculation gives
M11​=2b1​a11​−b12​=−811​<0.
(2)
A positive-semidefinite matrix cannot have a negative diagonal entry. Hence
the method is not algebraically stable.​
(3)

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