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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
What a lot of trouble one avoids if one refuses to have anything to do with the common herd! To have no job, to devote one’s time to literature, is the most wonderful thing in the world.
On the Good Life
Marcus Tullius Cicero
In the rarefied fraternity of people who have held the title of richest person on Earth, Musk and Gates have some similarities. Both have analytic minds, an ability to laser-focus, and an intellectual surety that edges into arrogance. Neither suffers fools. All of these traits made it likely they would eventually clash, which is what happened when Musk began giving Gates a tour of the factory.
Elon Musk
Walter Isaacson
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