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Upward arrows are often used to indicate an increase in a numerical value, and downward arrows indicate a decrease. In mathematical logic, a right-facing arrow indicates material conditional, and a left-right (bidirectional) arrow indicates if and only if, an upwards arrow indicates the NAND operator (negation of conjunction), an downwards arrow indicates the NOR operator (negation of ...
For other languages and symbol sets (especially in mathematics and science), see below This article contains special characters . Without proper rendering support , you may see question marks, boxes, or other symbols .
The arrow symbol ↓ may refer to: The downward direction, a relative direction; The keyboard cursor control key, an arrow key; A downwards arrow, a Unicode arrow symbol; Logical NOR, operator which produces a result that is the negation of logical OR; An undefined object, in mathematical well-definition; A mathematical symbol for "approaching ...
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Marks come in two varieties, abbreviations and abstract symbols. These are usually handwritten on the paper containing the text. Symbols are interleaved in the text, while abbreviations may be placed in a margin with an arrow pointing to the problematic text.
Miscellaneous Symbols and Arrows (Unicode block) includes more geometric shapes Miscellaneous Symbols and Pictographs (Unicode block) includes several geometric shapes of different colors Mathematical operators and symbols in Unicode
right fish tail Sometimes used for “relation”, also used for denoting various ad hoc relations (for example, for denoting “witnessing” in the context of Rosser's trick ). The fish hook is also used as strict implication by C.I.Lewis p {\displaystyle p} ⥽ q ≡ ( p → q ) {\displaystyle q\equiv \Box (p\rightarrow q)} .
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