First-order partial differential equation

https://www.wikidata.org/wiki/Q4381442

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Physics 33.5M papers	Mathematics 22.2M papers	Quantum mechanics 13.5M papers	Mathematical analysis 5.5M papers
Nonlinear system 1.1M papers	Differential equation 212k papers	Partial differential equation 132k papers
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First-order partial differential equation 10.3k papers
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Exact differential equation 4,216 papers	Integro-differential equation 3,286 papers	Inverse scattering transform 2,802 papers	Quantum inverse scattering method 1,271 papers
Hessian equation 974 papers	Liénard equation 896 papers	Universal differential equation 832 papers	Explicit and implicit methods 817 papers
Bernoulli differential equation 806 papers		Parametrix 561 papers

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