Advanced-Retarded Differential Equations in Quantum Photonic Systems
Unai Alvarez-Rodriguez, Armando Perez-Leija, Iñigo L. Egusquiza, Markus Gräfe, Mikel Sanz, Lucas Lamata, Alexander Szameit, and Enrique Solano, Sci. Rep. 7, 42933, (2017).
I propose English speakers to replace for quarantine & social distance issues “Let us keep in touch” by “Let us keep in distance”. More polite but technical variants may be “Let us keep in nonlocal touch”, “Let us keep in noncausal distance”, “Let us keep in uncorrelated touch”.
I constantly tell my students & researchers: never calculate anything if you do not know the answer. You only know the answer beforehand if the problem is perfectly well posed. Why to waste time & efforts calculating then? This philosophy is central to my way of doing research.
“To sail is necessary; to live is not”. “Navigare necesse; vivere non est necesse”. 1st century BC in Latin by Roman General Pompeu. “Living is not necessary, to create is”. Viver não é necessario; o que é necessario é criar”. 20th century in Portuguese by genius Fernando Pessoa
