![]() ![]() Logical biconditional becomes the equality binary relation, and negation becomes a bijection which permutes true and false. Corresponding semantics of logical connectives are truth functions, whose values are expressed in the form of truth tables. This set of two values is also called the Boolean domain. ![]() ![]() ![]() In classical logic, with its intended semantics, the truth values are true (denoted by 1 or the verum ⊤), and untrue or false (denoted by 0 or the falsum ⊥) that is, classical logic is a two-valued logic. Sometimes these classes of expressions are called "truthy" and "falsy" / "false". Typically (though this varies by programming language) expressions like the number zero, the empty string, empty lists, and null evaluate to false, and strings with content (like "abc"), other numbers, and objects evaluate to true. In some programming languages, any expression can be evaluated in a context that expects a Boolean data type. In logic and mathematics, a truth value, sometimes called a logical value, is a value indicating the relation of a proposition to truth, which in classical logic has only two possible values ( true or false). ( Learn how and when to remove this template message) Please consider expanding the lead to provide an accessible overview of all important aspects of the article. This article's lead section may be too short to adequately summarize the key points. ![]()
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