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In quantum mechanics, the Hamiltonian of a system is an operator corresponding to the total energy of that system, including both kinetic energy and potential energy. Its spectrum, the system's energy spectrum or its set of energy eigenvalues, is the set of possible outcomes obtainable from a measurement of the system's total energy. Due to its close relation to the energy spectrum and time-evolution of a system, it is of fundamental importance in most formulations of quantum theory.
Hamiltonian (Quantum Mechanics) - Wikipedia
en.wikipedia.org
Chanel did the opposite. She welcomed all sorts of people into her shows and allowed them to take photographs. She knew this would only encourage the many people who made a living out of creating cheap versions of her clothes, but she wanted this. She even invited wealthy women to bring along their seamstresses, who would make sketches of the designs and then create replicas of them. More than making money, what she wanted most of all was to spread her fashions everywhere, to feel herself and her work to be objects of desire by women of all classes and nations. It would be the ultimate revenge for the girl who had grown up ignored, unloved, and shunned. She would clothe millions of women; her look, her imprint would be seen everywhere—as indeed it was a few years after her comeback.
The Laws of Human Nature
Robert Greene
In physics, the reciprocal lattice represents the Fourier transform of another lattice (usually a Bravais lattice). In normal usage, the initial lattice (whose transform is represented by the reciprocal lattice) is usually a periodic spatial function in real-space and is also known as the direct lattice. While the direct lattice exists in real-space and is what one would commonly understand as a physical lattice (e.g., a lattice of a crystal), the reciprocal lattice exists in reciprocal space (also known as momentum space or less commonly as K-space, due to the relationship between the Pontryagin duals momentum and position)
Reciprocal Lattice - Wikipedia
primitive vectors
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