what are boolean expressions?

Question

i understand that they are used in search engines asking specifics

i understand that they are used in maths but they are also used in search engines defining searchs e.g. AND, NOT, OR, FOLLOWED BY, NEAR, these are known as boolean operators, are the expressions the actual words or the sentances used with these words

Answer 1

A boolean expression is a statement that evaluates to TRUE or FALSE. Generally, these use what are called "relational" operators that test an assertion to be true or false, for example:

4 > 3 = TRUE
5 < 4 = FALSE

Boolean expressions are in contrast to arithmetic expressions such as:

4 + 3 = 7
5 - 4 = 1

What you're thinking of are logical operators such as "AND" and "OR", which also are used in boolean expressions, as in:

( 4 > 3 ) AND ( 5 > 3 ) = TRUE
(4 > 3 ) OR ( 5 < 3 ) = TRUE

Where AND means both sides must be TRUE for the entire statement to be true, and OR means that either side must be TRUE for the statement to be true.

Answer 2

Boolean logic is the manipulation of boolean variables, a boolean variable can be either TRUE or FALSE.

A boolean expression is like an algebraic expression (formula), but the variables (A, B, X etc.) in algebra have numeric values, in a boolean expression the variables can only have TRUE or FALSE as values.

An alternative description for boolean would be "binary" and/or "logic" operators in boolean expressions are the same as gates in binary circuits. NOT reverses the value others are AND (both values being true, yields true) and OR (one or both values being true, yields true) NAND and NOR are AND and OR with the output reversed.

Answer 3

TRUE or FALSE