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In mathematics, the empty set or void set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. [1] Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set , while in other theories, its existence can be deduced.
The term void ab initio, which means "to be treated as invalid from the outset", comes from adding the Latin phrase ab initio (from the beginning) as a qualifier. For example, in many jurisdictions where a person signs a contract under duress, that contract is treated as being void ab initio. The frequent combination "null and void" is a legal ...
A difference exists between a void marriage and a voidable marriage. A void marriage is a marriage that was not legally valid under the laws of the jurisdiction where the marriage occurred, and is void ab initio. Although the marriage is void as a matter of law, in some jurisdictions an annulment is required to establish that the marriage is ...
A void marriage is a marriage that is unlawful or invalid under the laws of the jurisdiction where it is entered. A void marriage is invalid from its beginning, ...
A protest vote (also called a blank, null, spoiled, or "none of the above" vote) [1] is a vote cast in an election to demonstrate dissatisfaction with the choice of candidates or the current political system. [2] Protest voting takes a variety of forms and reflects numerous voter motivations, including political apathy. [3]
Practically, a contract can be declared to be void by a court of law. [1] An agreement to carry out an illegal act is an example of a void agreement. For example, an agreement between drug dealers and buyers is a void agreement simply because the terms of the contract are illegal. In such a case, neither party can go to court to enforce the ...
The wrapper type Void is often used when a unit type parameter is needed. Although the Void type can never have any instances, it does have one value, null (like all other reference types), so it acts as a unit type. In practice, any other non-instantiable type, e.g. Math, can also be used for this purpose, since they also have exactly one ...
However, there are some significant differences between divorce and annulment. Divorce is concerned merely with the legal effects of marriage. Annulment, however, is also concerned with the reality of whether or not a true marriage was ever formed. This leads to the second difference. At least in most countries, divorce is always possible.