dual number
Word Rarity
Uncommon
Frequency: Zipf frequency 4.26 in modern English
15
Scrabble Score
10
Letters
3
Syllables
9
Unique Chars
Meaning
noun
A grammatical number denoting a quantity of exactly two.
noun
An element of an algebra (the algebra of dual numbers) which includes the real numbers and an element ε which satisfies ε ≠ 0 and ε² = 0.
Example Sentences
- "This is particularly the case with regard to the pronouns of the dual number, which form one of the peculiarities of the language."
- "Eteocles and Polyneices are enemy brothers, that is, they are alike in spite of the difference erected by being on opposite sides of the Theban battlements.¹ By uniting them with the dual number in the description of their deaths, Sophocles has the elders speak of them as indistinguishable in their hatred, spear work, and deaths."
- "In most languages, singular and plural are used to indicate number. Slovene, however, has an additional ‘dual’ number, which is used when referring to two of anything. This dual number existed in many languages at one stage in their development, but has been lost; in Slovene, though, […]"
- "Classical Arabic has a fully functional dual number, which requires dual agreement in verbs, adjectives and pronouns."
- "If f(x) is a polynomial or a power series then its derivative can be obtained “automatically” using dual numbers as follows: f'(x)#61;#123;f(x#43;#92;epsilon)-f(x)#92;over#92;epsilon#125; where f(x#43;#92;epsilon) should be expanded using the algebra of dual numbers. The role of the ε is therein similar to that of an infinitesimal."
- "In the special case of the algebra #92;mathbf#123;D#125; of dual numbers we get the vertical tangent bundle V."