= James D. Stasheff
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<James D. Stasheff> works on <topology> and its algebraic structures. With <John Milnor>, he wrote <Characteristic Classes by John Milnor and James D. Stasheff>, developing invariants that detect how vector bundles twist over a space.<Characteristic Classes by John Milnor and James D. Stasheff>[Original book byline and characteristic-class development]{ref}
The total <Pontryagin class> illustrates the importance of coefficient conventions: its product formula is stated modulo elements of order two in their theorem. Keeping that qualification prevents an integral statement from being inferred from a result valid only after removing a torsion ambiguity.<Characteristic Classes by John Milnor and James D. Stasheff>[Chapter 15, Theorem 15.3]{ref}
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