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In mathematics, the additive inverse of an element x, denoted -x [1], is the element that when added to x, yields the additive identity, 0 [2].In the most familiar cases, this is the number 0, but it can also refer to a more generalized zero element.
In the sign–magnitude representation, also called sign-and-magnitude or signed magnitude, a signed number is represented by the bit pattern corresponding to the sign of the number for the sign bit (often the most significant bit, set to 0 for a positive number and to 1 for a negative number), and the magnitude of the number (or absolute value ...
In 1557 Robert Recorde published The Whetstone of Witte which introduced the equal sign (=), as well as plus and minus signs for the English reader. In 1564, Gerolamo Cardano analyzed games of chance beginning the early stages of probability theory.
A homotopy between two embeddings of the torus into R 3: as "the surface of a doughnut" and as "the surface of a coffee mug".This is also an example of an isotopy.. Formally, a homotopy between two continuous functions f and g from a topological space X to a topological space Y is defined to be a continuous function: [,] from the product of the space X with the unit interval [0, 1] to Y such ...
Some of special key inscriptions are changed to a graphical symbol (e.g. ⇪ Caps Lock is an upward arrow, ← Backspace a leftward arrow). Most of the other abbreviations are replaced by German abbreviations (thus e.g. "Ctrl" is translated to its German equivalent "Strg", for Steuerung). "Esc" remains as such. (See § Key labels.)
If A is a set, then the absolute complement of A (or simply the complement of A) is the set of elements not in A (within a larger set that is implicitly defined). In other words, let U be a set that contains all the elements under study; if there is no need to mention U, either because it has been previously specified, or it is obvious and unique, then the absolute complement of A is the ...
The hyphen ‐ is a punctuation mark used to join words and to separate syllables of a single word. The use of hyphens is called hyphenation. [1]The hyphen is sometimes confused with dashes (en dash –, em dash — and others), which are wider, or with the minus sign −, which is also wider and usually drawn a little higher to match the crossbar in the plus sign +.
A dioptre (British spelling) or diopter (American spelling), symbol dpt (or D), is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m −1. It is normally used to express the optical power of a lens or curved mirror , which is a physical quantity equal to the reciprocal of the focal length ...