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Chinese Remainder

Tool to compute congruences with the chinese remainder theorem. The Chinese Remainder Theorem helps to solve congruence equation systems in modular arithmetic.

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Chinese Remainder -

Tag(s) : Mathematics,Arithmetics

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Chinese Remainder

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Chinese Remainder Calculator



Tool to compute congruences with the chinese remainder theorem. The Chinese Remainder Theorem helps to solve congruence equation systems in modular arithmetic.

Answers to Questions

What is the Chinese Remainder Theorem ?

The Chinese remainder theorem is the name given to a system of congrances (modular equationshref). The original problem is to consider a number of elements which we know the remainder of their Euclidean divisionhref.

If they are arranged by 3 there remains 2. If they are arranged by 5, there remain 3 and if they are arranged by 7, there remain 2. How many objects are there?

Consider a list of \( k \) coprimeshref integers \( n_1, ..., n_k \) and their product \( n = \prod_{i=1}^k n_i \). For all integers \( a_1, ... , a_k \), it exists another integer \( x \) which is unique modulo \( n \), such as :

$$ \begin{matrix} x \equiv a_1\pmod{n_1} \\ \ldots \\ x \equiv a_k\pmod{n_k} \end{matrix} $$

How to calculate chinese remainder?

To find a solution of the congruence system, consider the numbers \( \hat{n}_i = \frac n{n_i} = n_1 \ldots n_{i-1}n_{i+1}\ldots n_k \) which are also coprimeshref. To find the modular inverses, you can use the Bezout theorem to find integers \( u_i \) and \( v_i \) such as \( u_i n_i + v_i \hat{n}_i = 1 \). Here, \( v_i \) is the modular inversehref of \( \hat{n}_i \) modulo \( n_i \).

Consider then the numbers \( e_i = v_i \hat{n}_i \equiv 1 \mod{n_i} \). A particular solution of the Chinese remainders theorem is $$ x = \sum_{i=1}^k a_i e_i~ $$

dCode accepts numbers as pairs (remainder, modulo), but the simplest is to write x = A mod B

\( (2,3),(3,5),(2,7) \iff \left\{ \begin{array}{ll} x = 2 \mod 3 \\ x = 3 \mod 5 \\ x = 2 \mod 7 \end{array} \right. \Rightarrow x = 23 \)

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