Proof
(related to Proposition: Multiplication of Congruences with a Positive Factor)
By hypothesis, $a,b$ are integers and $c > 0, m > 0$ are positive integers.
"$\Rightarrow$"
"$\Leftarrow$"
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References
Bibliography
- Landau, Edmund: "Vorlesungen über Zahlentheorie, Aus der Elementaren Zahlentheorie", S. Hirzel, Leipzig, 1927