# Equal

Two quantities are said to be equal if they are, in some well-defined sense, equivalent. Equality of quantities *a* and *b* is written *a* = *b*.

Equal is an elementary-school-level concept.

Two quantities are said to be equal if they are, in some well-defined sense, equivalent. Equality of quantities *a* and *b* is written *a* = *b*.

Equal is an elementary-school-level concept.