👉 Levins, also known as Levenson's or Levins' lemma, is a fundamental theorem in mathematical logic and set theory that deals with the existence of infinite sets. It states that if there exists an infinite set A such that for every infinite subset B of A, either B has exactly one element or B is equal to A itself, then A must be countable. In other words, if we consider a set A as infinitely large (i.e., its cardinality grows without
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👉 The term "Leisson" is a molecular spectroscopy technique used to study the electronic structure of molecules. It involves the use of a laser light beam, which excites electrons in a molecule and causes them to jump from one energy level to another, creating an electric field that can be observed by a spectrometer. This process provides information about the electronic structure of the molecule, including its electronic transitions, the shape of its orbitals, and the distribution of electron density around the nucleus. Leisson
