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arrow-headed

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1
arrow-headed
ˈarrow-ˌheaded, a. [f. prec. + -ed.] 1. gen. Having the shape of an arrow-head.1876 Bancroft Hist. U.S. V. xiv. 490 At Princeton, where Donop had thrown up arrow-headed earthworks. 2. spec. = Cuneiform; applied to the characters of the ancient inscriptions of Nineveh, Babylon, Persepolis, etc.1816 T... Oxford English Dictionary
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Arrow (symbol)
of an actual arrow (e.g. ➵ U+27B5). The double-headed arrow representing logical equivalence was introduced by Albrecht Becker in Die Aristotelische Theorie der Möglichkeitsschlüsse, Berlin wikipedia.org
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USS Winged Arrow
Winged Arrow, U.S. Winged Arrow stood into Manila Bay on 14 May, moved to Subic Bay on 15 May, and headed for Samar on the 16th. wikipedia.org
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Using a truth table, is the sentence below a tautology, contradiction or contingency? (P ⇒ Q) ⇔ (¬P ∨ Q) Also, I am not sure what the double headed arrow is supposed to mean. I know a single headed arrow means "impl...
If we setup a truth table: $\begin{array}{|c|c|c|c|} \hline P & Q & \mathbf{P \rightarrow Q} & \mathbf{\neg P \vee Q} \\\ \hline 0 & 0 & \mathbf{1} & \mathbf{1}\\\ \hline 0 & 1 & \mathbf{1} & \mathbf{1}\\\ \hline 1 & 0 & \mathbf{0} & \mathbf{0}\\\ \hline 1 & 1 & \mathbf{1} & \mathbf{1}\\\ \hline \en...
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Arrow dragonet
The arrow dragonet (Callionymus sagitta), also known as the arrow-headed darter dragonet, is a species of dragonet widespread in the Indo-West Pacific References arrow dragonet Fish of South Asia Fish of East Asia Fish of Southeast Asia arrow dragonet wikipedia.org
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What does the notation $\twoheadrightarrow$ mean? I don't know what this double-arrow $\twoheadrightarrow$ means!
**Surjections are sometimes denoted by a two-headed rightwards arrow,** as in $f : X \twoheadrightarrow Y,\;$ [Boldface mine.]
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Flu-flu arrow
A flu-flu arrow is a type of arrow specifically designed to travel a short distance. , headed with a lead tip or pilum, hence our term pile, or target point. wikipedia.org
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set notation confusion - object t is a member of closed interval set? I'm reading through an introduction to basic set theory and have encountered the following .. $t\in [a, b] \Leftrightarrow a \leq t \:\&\: t \leq ...
You read it as: "$t$ belongs to the closed interval $[a,b]$ if and only if $a$ is smaller than or equal to $t$ and $t$ is smaller than or equal to $b$".
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The Dragon (Arrow)
"The Dragon" is the nineteenth episode of the sixth season, and 134th episode overall of The CW series Arrow. He also criticized the episode for failing to "offer a clear sense of where the season is headed in these final few weeks. [...] wikipedia.org
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injectivity question X1 ≠ X2 ⇒ F(X1) ≠ F (X2) I learned that in injectivity the following applies. X1 ≠ X2 ⇒ F(X1) ≠ F (X2) I was wondering if the other direction applies X1 ≠ X2 ⇐ F(X1) ≠ F (X2) or is it not possible...
The direction $F(X_1)\not=F(X_2)\implies X_1\not=X_2$ is a direct consequence of **the definition of "function."** A function can only take on one value per input, by definition. So $X_1=X_2\implies F(X_1)=F(X_2)$ for free, and this is the contrapositive of (hence, equivalent to) the property in que...
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Rootes Arrow
Above that were the Hunter Super and Hunter GL, both with the higher specification alloy headed engine and two different trim levels. The alloy headed "super" saloon got these changes plus a redesigned 'by Chrysler' boot lid badge, spray-on black, instead of silver, tail panel — the texture wikipedia.org
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Isomorphism in a commutative diagram, variation of snake lemma Suppose I have the following commutative diagram of groups, where the hooked arrows represent injections and the double-headed arrows represent surjection...
Moreover you must have $E=B$, and if you take $B=A$, with the arrow $A\to B$ being the identity, then $E$ is equal to a subgroup of $D$ and $F$ to the
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Black Arrow (1985 film)
The Black Arrow: A Tale of the Two Roses. Sir Richard and Joanna marry and ride off into the sunset, Ostensibly headed for Sir Daniel's Castle which Sir Richard has automatically inherited. wikipedia.org
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Understanding Intermediate value theorem. I will first state the theorem in my words and then my problem. > If function $f$ is continuous on $[a,b]$ and $f(a) > 0 > f(b)$ or $f(a) < 0 < f(b)$ then the function has **...
.$$ The forward arrow is an "if then" statement, and the double-headed arrow is an "if and only if" statement.
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Micrurus alleni
Micrurus alleni, the arrow-headed coral snake or Allen's coral snake, is a species of snake of the family Elapidae. wikipedia.org
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