# What does the word qed mean in math

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QED is a Latin phrase meaning “which was to be demonstrated” or “thus it has been demonstrated.” It is often used in mathematics to indicate the end of a proof. The phrase is derived from the Latin phrase quod erat demonstrandum, which translates literally to “what was to be demonstrated.”

In mathematics, a proof is a logical argument that establishes the truth of a statement. A proof typically consists of a series of steps, each of which follows logically from the previous step. At the end of the proof, the statement is either accepted as true or rejected as false. If the statement is accepted as true, the proof is said to be complete, and the phrase QED is used to indicate the end of the proof.

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QED is often used in mathematical writing as a sign of respect for the work of the mathematician who has provided the proof. It is a way of acknowledging the effort that went into the proof and expressing appreciation for the mathematician’s work. It is also used to indicate that the proof is complete and that no further steps need to be taken.

In addition to being used in mathematics, QED is also used in other fields, such as philosophy and computer science. In philosophy, it is used to indicate the end of an argument or the conclusion of a discussion. In computer science, it is used to indicate the end of a program or the completion of a task.

QED is a Latin phrase that is used to indicate the end of a proof in mathematics. It is a way of acknowledging the effort that went into the proof and expressing appreciation for the mathematician’s work. It is also used in other fields, such as philosophy and computer science, to indicate the end of an argument or the completion of a task.