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Time-keeping on this clock uses arithmetic modulo 12. Adding 4 hours to 9 o'clock gives 1 o'clock, since 13 is congruent to 1 modulo 12. In mathematics, modular arithmetic is a system of arithmetic for integers, where numbers "wrap around" when reaching a certain value, called the modulus.
In computing, the modulo operation returns the remainder or signed remainder of a division, after one number is divided by another, called the modulus of the operation.. Given two positive numbers a and n, a modulo n (often abbreviated as a mod n) is the remainder of the Euclidean division of a by n, where a is the dividend and n is the divisor.
Integer multiplication respects the congruence classes, that is, a ≡ a' and b ≡ b' (mod n) implies ab ≡ a'b' (mod n). This implies that the multiplication is associative, commutative, and that the class of 1 is the unique multiplicative identity. Finally, given a, the multiplicative inverse of a modulo n is an integer x satisfying ax ≡ ...
When ax ≡ 1 (mod m) has a solution it is often denoted in this way − x ≡ a − 1 ( mod m ) , {\displaystyle x\equiv a^{-1}{\pmod {m}},} but this can be considered an abuse of notation since it could be misinterpreted as the reciprocal of a {\displaystyle a} (which, contrary to the modular multiplicative inverse, is not an integer except ...
The AN/SPY-1 [a] is a United States Navy passive electronically scanned array (PESA) 3D radar system manufactured by Lockheed Martin, and is a key component of the Aegis Combat System.
As of 17 February 2023, the entire class is stored, with all except AN1 (which is in Port Augusta) in storage at South Dynon. In December 2023 the class has been making a return to service with AN1 running from Port Augusta on 4PM4 (3 December) and returning 6MP5 (9 December) after a trip to Spotswood. AN3 and AN8 are also at Spotswood.
The AN.1 was a two-seat reconnaissance aircraft built primarily to explore the suitability of diesel engines for tasks requiring long distance flying. In the early 1930s, diesel engines seemed to offer several advantages in such situations, particularly better reliability because of greater mechanical simplicity and lower fuel consumption, because of greater thermodynamic efficiency.
Mark 1A Computer Mk 37 Director above the bridge of destroyer USS Cassin Young with AN/SPG-25 radar antenna. The Mark 1, and later the Mark 1A, Fire Control Computer was a component of the Mark 37 Gun Fire Control System deployed by the United States Navy during World War II and up to 1991 and possibly later.