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The binary digital sum is crucial for the theory of the game of Nim. The digital sum in base b is an associative and commutative operation on the natural numbers; it has 0 as neutral element and every natural number has an inverse element under this operation. The natural numbers together with the base-b digital sum thus form an abelian group ...
The digit sum - add the digits of the representation of a number in a given base. For example, considering 84001 in base 10 the digit sum would be 8 + 4 + 0 + 0 + 1 = 13. The digital root - repeatedly apply the digit sum operation to the representation of a number in a given base until the outcome is a single digit. For example, considering ...
"A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]
In general, if b is the base, one writes a number in the numeral system of base b by expressing it in the form a n b n + a n − 1 b n − 1 + a n − 2 b n − 2 + ... + a 0 b 0 and writing the enumerated digits a n a n − 1 a n − 2... a 0 in descending order. The digits are natural numbers between 0 and b − 1, inclusive.
Since 1946, the laws passed by the Congress, including legal codes, have been titled Republic Acts. [b] While Philippine legal codes are, strictly speaking, also Republic Acts, they may be differentiated in that the former represents a more comprehensive effort in embodying all aspects of a general area of law into just one legislative act.
Digit sums and digital roots can be used for quick divisibility tests: a natural number is divisible by 3 or 9 if and only if its digit sum (or digital root) is divisible by 3 or 9, respectively. For divisibility by 9, this test is called the rule of nines and is the basis of the casting out nines technique for checking calculations.
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B.P. [2] nationwide law Tagalog Abbreviation for Batas Pambansa, the name for laws passed by the defunct unicameral Batasang Pambansa. C.A. N/A: English Abbreviation for either Commonwealth Act and Court of Appeals, depending on context. destierro: exile Spanish See Revised Penal Code § Penalties. eCourt N/A: English