Definition: In mathematics, a Jacobus is a type of finite group. A group can be described as a set of elements with certain properties that are defined by their structure and operation. In this context, a Jacobus (also known as a Jacobian) is a subset of the multiplicative group of integers modulo n. A group is defined as a collection of objects called "elements" together with an operation that combines two elements to form another element, satisfying certain conditions. A finite group is a group
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