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Not every kind of hard is good. There is good pain and bad pain. You want the kind of pain you get from going running, not the kind you get from stepping on a nail.
Hackers & Painters - Big Ideas From the Computer Age
Paul Graham
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
Fifth. Write out a clear, concise statement of the amount of money you intend to acquire, name the time limit for its acquisition, state what you intend to give in return for the money, and describe clearly the plan through which you intend to accumulate it.
Think and Grow Rich
Hill, Napoleon
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