PROPER COVERS OF RESTRICTION SEMIGROUPS AND W
... By the Wagner–Preston theorem, such a restriction semigroup is, up to (2, 1, 1)-isomorphism, a (2, 1, 1)-subsemigroup of (I(X); ·, + , ∗ ) for some set X, where I(X) is the set of all partial bijections on X, and α+ = 1dom α ...
... By the Wagner–Preston theorem, such a restriction semigroup is, up to (2, 1, 1)-isomorphism, a (2, 1, 1)-subsemigroup of (I(X); ·, + , ∗ ) for some set X, where I(X) is the set of all partial bijections on X, and α+ = 1dom α ...
number_theory
... • Suppose n=pq is the product of two primes congruent to 3 mod 4 (type 4k+3), and let y with gcd(y,n)=1 has a square root mod n. Then finding the four solutions x=±a, ±b to x2 ≡ y (mod n) is computationally equivalent to factoring n which is regarded as extremely difficult when n is large, say n has ...
... • Suppose n=pq is the product of two primes congruent to 3 mod 4 (type 4k+3), and let y with gcd(y,n)=1 has a square root mod n. Then finding the four solutions x=±a, ±b to x2 ≡ y (mod n) is computationally equivalent to factoring n which is regarded as extremely difficult when n is large, say n has ...
Diskrete Mathematik für Informatik (SS 2017)
... broadcast stations within Austria. We are told that the area serviced by a station lies within a disk with radius 50 kilometers. Obviously, no two different stations whose broadcast areas overlap may use the same frequency. ...
... broadcast stations within Austria. We are told that the area serviced by a station lies within a disk with radius 50 kilometers. Obviously, no two different stations whose broadcast areas overlap may use the same frequency. ...