Lattice multiplication is also known as Italian multiplication, Gelosia multiplication, sieve multiplication, shabakh, Venetian squares, or the Hindu lattice. It uses a grid with diagonal lines to help the student break up a multiplication problem into smaller steps.
These grids are designed to integrate Legendre polynomials of cos(beta) with machine precision accuracy up to the rank specified. The accuracy degrades abruptly and significantly after that rank. These grids should be only be used for systems with axial symmetry, where the symmetry axis of the input orientation is aligned along the Z direction of the laboratory frame.
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