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\langle f,g\rangle =\int \limits _{(\Omega _{1}\times \Omega _{2})}K(x_{1},x_{2})f(x_{1})g(x_{2})d(\Omega _{1}\times \Omega _{2})} ⟨ f , g ⟩ = ∫ Ω K ( x ) f...

}}(\mathbf {r} )e^{-i\omega t}+{\mbox{c. c.}}\right]=\Re [{\tilde {\mathbf {H} }}(\mathbf {r} )e^{-i\omega t}].} дзе ω   {\displaystyle \omega \ }  — частата...

Sherff, Earl Edward, 1951: Epiphytum, a new section of the genus Dahlia Cav. Bot Leaflets: 4,21 Hansen, H. V. (2004). "Simplified keys to four sections with...