I Claude Naiver work on Navier-Stokes equations

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Claude Navier's two works on fluid motion, "Sur les lois des mouvements des fluides, en ayant égard à l’adhésion des molecules" (memoire 1) and "Sur Les Lois du Mouvement des Fluides" (memoire 2), were both written in 1821, with the second published in 1822. Memoire 1 is significant for introducing the viscous term μ∇²u, which is crucial for understanding fluid dynamics. However, there is difficulty in locating a PDF of memoire 1, as it appears to be unpublished. The formulation discussed in the thread aligns with Navier's contributions in memoire 1, although the exact notation may differ. Overall, these works laid foundational principles for the Navier-Stokes equations.
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I am interested what are main differences/news in two Claude Navier works "Sur les lois des mouvements des fluides, en ayant égard à l’adhésion des molecules"- memoire 1 and "Sur Les Lois du Mouvement des Fluides" memoire-2?

Are both works written(not published) in 1821? Does memoire 1 introduced visocus term μ∇2u?

I cant find pdf of memoire 1..

"Sur Les Lois du Mouvement des Fluides"
https://perso.crans.org/epalle/M2/EC/Histoire/Navier1822MemoireSurLesLoisDuMouvementDesFluides.pdf

Is this formulation(dont have to be same notation) what Navier introduced in 1821 memoire 1?
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