Typos or incorrect sentences:

- P.3, Eq.(15), line 1: $(UK)(UK)^\dagger(I-UU^\dagger) = (I-P)(I-UU^\dagger) = 0$
- P.3, col.2, line 23: The above problem has a unique minimum-norm solution, which equals...
- P.4, col.1, line 19: The unique minimum-norm solution...