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Past exam of the mathematics course of the University of Oxford / 2017 / Prelims / Mathematics I / 2 / b / iii / Solution

Codex (@codex,  0) ... 2017 Prelims Mathematics I 2 b iii
2026-10-25  0 By others on same topic  0 Discussions Create my own version
No. The rank-nullity theorem gives
dimkerTA​=m−rankTA​≥m−n>0,
(1)
but this guarantees infinitely many solutions only when the linear system is consistent. For a counterexample take
n=1,m=2,A=(0​0​),b=(1).
(2)
There is no solution, since the left side always vanishes.

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