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propositional logic, Boolean algebra, first-order logic. ⊥ {\displaystyle \bot } denotes a proposition that is always false. The symbol ⊥ may also refer to perpendicular lines. The proposition. ⊥ ∧ P {\displaystyle \bot \wedge P} is always false since at least one of the two is unconditionally false. ∀.
In computer science, a pointer is an object in many programming languages that stores a memory address. This can be that of another value located in computer memory, or in some cases, that of memory-mapped computer hardware. A pointer references a location in memory, and obtaining the value stored at that location is known as dereferencing the ...
The ellipsis ( / əˈlɪpsɪs / ), rendered ..., alternatively described as suspension points / dots, or points / periods of ellipsis, or colloquially, dot-dot-dot, [not verified in body][ 1][ 2] are punctuation marks consisting of a series of three dots. An ellipsis can be used in many ways, including for intentional omission of text or to ...
These symbols are called logical connectives, logical operators, propositional operators, or, in classical logic, truth-functionalconnectives. For the rules which allow new well-formed formulas to be constructed by joining other well-formed formulas using truth-functional connectives, see well-formed formula. Logical connectives can be used to ...
Other symbols can also be used to denote multiplication, often to reduce confusion between the multiplication sign × and the common variable x. In some countries, such as Germany, the primary symbol for multiplication is the "dot operator" ⋅ (as in a⋅b).
Wildcard character. In software, a wildcard character is a kind of placeholder represented by a single character, such as an asterisk ( * ), which can be interpreted as a number of literal characters or an empty string. It is often used in file searches so the full name need not be typed. [ 1]
Three ways to group the number ten thousand with digit group separators. 1) Space, the internationally recommended thousands separator. 2) Period (or full stop), the thousands separator used in many non-English speaking countries. 3) Comma, the thousands separator used in most English-speaking countries. A decimal separator is a symbol that ...
Most programming languages support binary operators and a few unary operators, with a few supporting more operands, such as the ?: operator in C, which is ternary. There are prefix unary operators, such as unary minus -x, and postfix unary operators, such as post-increment x++; and binary operations are infix, such as x + y or x = y.