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4D-Var Theoretical and Algorithmic Lineage (1986–1997)

1. The 1986 Tellus Foundation: Le Dimet and Talagrand

2. Earlier Antecedents: Sasaki and Early Adjoint Work (1958–1981)

3. The Numerical Demonstration: Talagrand and Courtier 1987–1990

4. Late 1980s–Early 1990s Development: ECMWF and Météo-France

5. The Incremental Insight: Courtier–Thépaut–Hollingsworth 1994

6. The 1994–1997 Operational Development at ECMWF

7. Adjoint Coding Infrastructure and Automatic Differentiation

8. Parallel Developments: Sequential Methods and Kalman Filters

9. Deployment Eve Summary

Research in progress