That sounds like the definition for Recursive Formula.
It is an expression.
A expression that only contains numbers is a Numerical
Constants (numbers), variables, the four basic operations of arithmetic (+, -, *, /) as well as brackets and indices (including negative and fractional ones).
It is evaluating the expression.
algebraic expression consists of numbers and operations
An expression.
Expression
Algebraic expression
It is an expression.
A mathematical phrase that contains operations, numbers, or variables is called an algebraic expression. Algebraic expressions consist of constants (numbers), variables (letters representing unknown quantities), and mathematical operations such as addition, subtraction, multiplication, division, and exponentiation. These expressions can be simplified, evaluated, or manipulated using algebraic rules and properties.
They are terms of an expression or an equation
A expression that only contains numbers is a Numerical
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Constants (numbers), variables, the four basic operations of arithmetic (+, -, *, /) as well as brackets and indices (including negative and fractional ones).
It is evaluating the expression.
An Algebraic Expression.
An expression is made up of numbers and variables joined by mathematical operations.