Altering finitely many terms of the sequence un does not affect the validity of (9).
the all-one sequence
Let (an) be the sequence of zeros of f arranged so that |a1|≤|a2|≤......
Extend this sequence of numbers backwards, defining N-1, N-2 and N-3 by......
Then the sequence (8) breaks off in split exact sequences.
Thus the long exact sequence breaks up into short sequences.
The exact sequence ends on the right with H(X).
The proof proper [= The actual proof] will consist of establishing the following statements in sequence.
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