Luis Manuel Braga da Costa Campos was Chair Professor and the Coordinator of the Scientific Area of Applied and Aerospace Mechanics in the Department of Mechanical Engineering and also the director (and founder) of the Center for Aeronautical and Space Science and Technology until retirement in 2020.L.A. R. Vilela is currently completing an Integrated Master's degree in Aerospace Engineering at Institute Superior Tecnico (1ST) of Lisbon University.

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• 1. Classes of Equations and Similarity Solutions. 1.1. Hierarchy of Partial Differential Equations. 1.2 General Integral and Arbitrary Functions. 1.3. Unforced P.D.E. with First-Order Derivatives. 1.4. Quasi-Linear and Forced First-Order P.D.E.s. 1.5. Differentials of First-Degree in Three Variables. 1.6. P.D.E.s with Constant Coefficients and All Derivatives of Same Order. 1.7. Harmonic and Biharmonic Functions on the Plane. 1.8. Forced Linear P.D.E. with Derivatives of Constant Order. 1.9. Forced Harmonic and Biharmonic Equations. 1.10. Conclusion. 2. Thermodynamics and Irreversibility. 2.1. Work, Heat, Entropy and Temperature. 2.2. Functions of State and Constitutive Properties. 2.3. Three Principles and Four Processes of Thermodynamics. 2.4. Entropy Production and Diffusive Properties.

Luis Manuel Braga da Costa Campos was Chair Professor and the Coordinator of the Scientific Area of Applied and Aerospace Mechanics in the Department of Mechanical Engineering and also the director (and founder) of the Center for Aeronautical and Space Science and Technology until retirement in 2020.L.A. R. Vilela is currently completing an Integrated Master's degree in Aerospace Engineering at Institute Superior Tecnico (1ST) of Lisbon University.

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• 1. Classes of Equations and Similarity Solutions. 1.1. Hierarchy of Partial Differential Equations. 1.2 General Integral and Arbitrary Functions. 1.3. Unforced P.D.E. with First-Order Derivatives. 1.4. Quasi-Linear and Forced First-Order P.D.E.s. 1.5. Differentials of First-Degree in Three Variables. 1.6. P.D.E.s with Constant Coefficients and All Derivatives of Same Order. 1.7. Harmonic and Biharmonic Functions on the Plane. 1.8. Forced Linear P.D.E. with Derivatives of Constant Order. 1.9. Forced Harmonic and Biharmonic Equations. 1.10. Conclusion. 2. Thermodynamics and Irreversibility. 2.1. Work, Heat, Entropy and Temperature. 2.2. Functions of State and Constitutive Properties. 2.3. Three Principles and Four Processes of Thermodynamics. 2.4. Entropy Production and Diffusive Properties.

Luis Manuel Braga da Costa Campos was Chair Professor and the Coordinator of the Scientific Area of Applied and Aerospace Mechanics in the Department of Mechanical Engineering and also the director (and founder) of the Center for Aeronautical and Space Science and Technology until retirement in 2020.L.A. R. Vilela is currently completing an Integrated Master's degree in Aerospace Engineering at Institute Superior Tecnico (1ST) of Lisbon University.

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• 1. Classes of Equations and Similarity Solutions. 1.1. Hierarchy of Partial Differential Equations. 1.2 General Integral and Arbitrary Functions. 1.3. Unforced P.D.E. with First-Order Derivatives. 1.4. Quasi-Linear and Forced First-Order P.D.E.s. 1.5. Differentials of First-Degree in Three Variables. 1.6. P.D.E.s with Constant Coefficients and All Derivatives of Same Order. 1.7. Harmonic and Biharmonic Functions on the Plane. 1.8. Forced Linear P.D.E. with Derivatives of Constant Order. 1.9. Forced Harmonic and Biharmonic Equations. 1.10. Conclusion. 2. Thermodynamics and Irreversibility. 2.1. Work, Heat, Entropy and Temperature. 2.2. Functions of State and Constitutive Properties. 2.3. Three Principles and Four Processes of Thermodynamics. 2.4. Entropy Production and Diffusive Properties.