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↑ (other)
The symbol ↑, an upward pointing arrow, also called up arrow, uparrow, or upwards arrow, may refer to: Notation * ↑, a mathematical symbol for "undefined" * ↑, a notation of Knuth's up-arrow notation for very large integers * ↑, a mathematical game theory position ''Up'' * ↑ or Sheffer stroke, the logical connective "not both" or NAND * ↑, the APL function 'take' * "Increased" (and similar meanings), in medical notation * ↑, a chemical symbol for production of gas, which bubbles up. Character representations * ↑, upwards arrow, a Unicode arrow symbol * ↑, ↑, a HTML or XML character entity * ↑, codepoint 8A (hex) in EBCDIC Code page 293, used for writing APL * ↑, the glyph for character 94 (decimal) in ASCII until 1967, when it was replaced by the caret (^). See also * Ꙟ, an archaic Romanian Cyrillic letter * Arrow keys, on computer keyboards * Arrow (other) ** ↓ (other) ** → (other) → or -> may refer to: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Undefined (mathematics)
In mathematics, the term undefined is often used to refer to an expression which is not assigned an interpretation or a value (such as an indeterminate form, which has the propensity of assuming different values). The term can take on several different meanings depending on the context. For example: * In various branches of mathematics, certain concepts are introduced as primitive notions (e.g., the terms "point", "line" and "angle" in geometry). As these terms are not defined in terms of other concepts, they may be referred to as "undefined terms". * A function is said to be "undefined" at points outside of its domainfor example, the real-valued function f(x)=\sqrt is undefined for negative x (i.e., it assigns no value to negative arguments). * In algebra, some arithmetic operations may not assign a meaning to certain values of its operands (e.g., division by zero). In which case, the expressions involving such operands are termed "undefined". Undefined terms In ancient tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |