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Polyrhombs are polyforms obtained from a rhombic grid, illustrated above. The numbers of polyrhombs with n=1, 2, ... components are 1, 1, 3, 7, 20, 62, 204, ... (OEIS ...
The term used in physics and engineering for a harmonic function. Potential functions are extremely useful, for example, in electromagnetism, where they reduce the study of a ...
1 and -1 are the only integers which divide every integer. They are therefore called the prime units.
A pyritohedron is an irregular dodecahedron composed of identical irregular pentagons. The name "pyritohedron" derives from that fact that a common crystal form in pyrite has ...
Given a polynomial in a single complex variable with complex coefficients p(z)=a_nz^n+a_(n-1)z^(n-1)+...+a_0, the reciprocal polynomial is defined by ...
The kernel of a ring homomorphism f:R-->S is the set of all elements of R which are mapped to zero. It is the kernel of f as a homomorphism of additive groups. It is an ideal ...
Assemble six 1×2×2 blocks and three 1×1×1 blocks into a 3×3×3 cube.
The dual polyhedron of the small dodecicosahedron U_(50) and Wenninger dual W_(90).
The space join of a topological space X and a point P, C(X)=X*P.
Two numbers which are relatively prime.
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