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Investigations involving the theory and applications of mathematical analytic tools and techniques are remarkably wide-spread in many diverse areas of the mathematical, physical, chemical, engineering and statistical sciences. In this Special Issue, we invite and welcome review, expository and original research articles dealing with the recent advances in mathematical analysis and its multidisciplinary applications.

Mathematical (or Higher Transcendental) Functions and Their Applications --- Fractional Calculus and Its Applications --- q-Series and q-Polynomials --- Analytic Number Theory --- Special Functions of Mathematical Physics and Applied Mathematics --- Geometric Function Theory of Complex Analysis

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For the 250th birthday of Joseph Fourier, born in 1768 in Auxerre, France, this MDPI Special Issue will explore modern topics related to Fourier Analysis and Heat Equation. Modern developments of Fourier analysis during the 20th century have explored generalizations of Fourier and Fourier–Plancherel formula for non-commutative harmonic analysis, applied to locally-compact, non-Abelian groups. In parallel, the theory of coherent states and wavelets has been generalized over Lie groups. One should add the developments, over the last 30 years, of the applications of harmonic analysis to the description of the fascinating world of aperiodic structures in condensed matter physics. The notions of model sets, introduced by Y. Meyer, and of almost periodic functions, have revealed themselves to be extremely fruitful in this domain of natural sciences. The name of Joseph Fourier is also inseparable from the study of the mathematics of heat. Modern research on heat equations explores the extension of the classical diffusion equation on Riemannian, sub-Riemannian manifolds, and Lie groups. In parallel, in geometric mechanics, Jean-Marie Souriau interpreted the temperature vector of Planck as a space-time vector, obtaining, in this way, a phenomenological model of continuous media, which presents some interesting properties. One last comment concerns the fundamental contributions of Fourier analysis to quantum physics: Quantum mechanics and quantum field theory. The content of this Special Issue will highlight papers exploring non-commutative Fourier harmonic analysis, spectral properties of aperiodic order, the hypoelliptic heat equation, and the relativistic heat equation in the context of Information Theory and Geometric Science of Information.

Weyl-Heisenberg group --- affine group --- Weyl quantization --- Wigner function --- covariant integral quantization --- Fourier analysis --- special functions --- rigged Hilbert spaces --- quantum mechanics --- signal processing --- non-Fourier heat conduction --- thermal expansion --- heat pulse experiments --- pseudo-temperature --- Guyer-Krumhansl equation --- higher order thermodynamics --- Lie groups thermodynamics --- homogeneous manifold --- poly-symplectic manifold --- dynamical systems --- non-equivariant cohomology --- Lie group machine learning --- Souriau-Fisher metric --- Born–Jordan quantization --- short-time propagators --- time-slicing --- Van Vleck determinant --- thermodynamics --- symplectization --- metrics --- non-equilibrium processes --- interconnection --- discrete multivariate sine transforms --- orthogonal polynomials --- cubature formulas --- nonequilibrium thermodynamics --- variational formulation --- nonholonomic constraints --- irreversible processes --- discrete thermodynamic systems --- continuum thermodynamic systems --- fourier transform --- rigid body motions --- partial differential equations --- Lévy processes --- Lie Groups --- homogeneous spaces --- stochastic differential equations --- harmonic analysis on abstract space --- heat equation on manifolds and Lie Groups