ISBN-13: 9783540055600 / Angielski / Miękka / 1971 / 144 str.
Preliminary definitions and lemmas.- The groups ?i(a; M rel X) and ?i+1(B, a; M rel X).- Exactness and naturality.- Special computations of ?i(a; M rel X).- A classification theorem for ?i(B, a; M rel X).- Proof of the classification theorem.
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