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            "citation": "Leonhard Euler, Principes généraux du mouvement des fluides (written 1755, printed 1757); Uriel Frisch adaptation of Thomas E. Burton's English translation",
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        "description": "The source concerns classical smooth inviscid flow. A state relation and any additional temperature-like field are assumed; a modern compressible energy equation, viscosity, weak-solution theory and global existence are outside this contribution. The inspected English translation has modern corrective notes, which are separated from Euler's original authorship.",
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        {
          "citation": "Leonhard Euler, Principes généraux du mouvement des fluides (written 1755, printed 1757); Uriel Frisch adaptation of Thomas E. Burton's English translation",
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      "statement": "# Euler: general equations for inviscid fluid motion\n\nEuler formulated fluid motion using spatial velocity and density fields, mass conservation, material acceleration, pressure gradients and body forces. He also gave a rotational example showing that velocity-potential flow is only a special case.\n\nMass balance and force balance become coupled equations for fields rather than a description of one pipe or trajectory. The paper identifies pressure as part of the dynamical system and recognizes that boundary conditions are needed to select a flow. It explicitly retracts an earlier overgeneralization of potential motion. Writing equations did not solve the full initial-boundary-value problem.\n\n## Scientific scope\n\nThe source concerns classical smooth inviscid flow. A state relation and any additional temperature-like field are assumed; a modern compressible energy equation, viscosity, weak-solution theory and global existence are outside this contribution. The inspected English translation has modern corrective notes, which are separated from Euler's original authorship.\n\n## People and systems\n\nLeonhard Euler\n\n\n\n## Original sources\n\n- [Leonhard Euler, Principes généraux du mouvement des fluides (written 1755, printed 1757); Uriel Frisch adaptation of Thomas E. Burton's English translation](https://arxiv.org/pdf/0802.2383)\n",
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