The fact of being who or what a person or thing is
The characteristics determining this
(of an object) Serving to establish who the holder, owner, or wearer is by bearing their name and often other details such as a signature or photograph
A close similarity or affinity
A transformation that leaves an object unchanged
An element of a set that, if combined with another element by a specified binary operation, leaves that element unchanged
The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g., (x + 1)2 = x2 + 2x + 1
the essential character of a person or thing [n IDENTITIES]