identity

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Related to numerical identity: Qualitative identity

identity

a means of portraying arithmetically the enduring equality between two (or more) VARIABLES that are equal by definition. For example, £1 = 100p (or $1 = 100¢), and no matter how many pounds (or dollars) we have, they can always be converted into pennies (or cents) by multiplying by 100. Identities are generally given a three-bar ‘identity’ sign (=) to indicate that the value to the left of the three bars is identical to the value to the right of the sign. The QUANTITY THEORY OF MONEY is one of the best-known examples of an identity in economics, written as:

where M is the money stock, V is the velocity of circulation of money, P is the general price level and T is the number of transactions undertaken. See EQUATION.

References in periodicals archive ?
Character, Psychoanalytic Identification, and Numerical Identity, LOUISE BRADDOCK
In contrast, the potential to produce is the capacity to cause something else, and hence there is no need for numerical identity.
But even this, in its turn, has many senses: a) the numerical identity of the definition, the strongest case (e.
He calls them "perfect" and "imperfect" identity and we could assimilate them to numerical identity and specific (ordinary) identity (3), respectively.

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