AWhat changed
Set out backpropagation through time for dynamic systems, propagating sensitivities over an unfolded temporal computation.
Scientific scope
The record is Werbos's sole-author 1990 paper. It does not claim sole invention of reverse-mode automatic differentiation or ordinary feed-forward backpropagation, and it does not establish convergence for every recurrent architecture.
Evidence
The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is Werbos's sole-author 1990 paper. It does not claim sole invention of reverse-mode automatic differentiation or ordinary feed-forward backpropagation, and it does not establish convergence for every recurrent architecture.
Contributors
- P. J. Werbos · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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