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Cosa (chi) è type variables - definizione
TYPE OF VARIABLE STAR
Irregular variables
free variable
CLASSIFICATION OF VARIABLES IN A LOGIC FORMULA BASED ON WHETHER OR NOT THEY ARE INSIDE THE SCOPE OF A QUANTIFIER
Free variable; Bound variable; Variable binding operation; Variable-binding operation; Free variables; Bound variables; Unbound variable; Unbound variables; Variable-binding operator; Variable binding operator; Free and bound variables; Bound variable clash; Free and bound variable; Placeholder (computer programming); Free variables & bound variables; Free occurrence; Placeholder variable; Apparent variable
1. A variable referred to in a function, which is not an
argument of the function. In lambda-calculus, x is a {bound
variable} in the term M = x . T, and a free variable of T.
We say x is bound in M and free in T. If T contains a subterm
x . U then x is rebound in this term. This nested, inner
binding of x is said to "shadow" the outer binding.
Occurrences of x in U are free occurrences of the new x.
Variables bound at the top level of a program are technically
free variables within the terms to which they are bound but
are often treated specially because they can be compiled as
fixed addresses. Similarly, an identifier bound to a
recursive function is also technically a free variable within
its own body but is treated specially.
A closed term is one containing no free variables.
See also closure, lambda lifting, scope.
2. In logic, a variable which is not quantified (see
quantifier).
bound variable
CLASSIFICATION OF VARIABLES IN A LOGIC FORMULA BASED ON WHETHER OR NOT THEY ARE INSIDE THE SCOPE OF A QUANTIFIER
Free variable; Bound variable; Variable binding operation; Variable-binding operation; Free variables; Bound variables; Unbound variable; Unbound variables; Variable-binding operator; Variable binding operator; Free and bound variables; Bound variable clash; Free and bound variable; Placeholder (computer programming); Free variables & bound variables; Free occurrence; Placeholder variable; Apparent variable
1. A bound variable or formal argument in a function
definition is replaced by the actual argument when the
function is applied. In the lambda abstraction
x . M
x is the bound variable. However, x is a free variable of
the term M when M is considered on its own. M is the scope
of the binding of x.
2. In logic a bound variable is a quantified variable. See
quantifier.
Type (biology)
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![Linnaeus]], is the type species for the genus ''[[Bufo]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Bufo bufo (Marek Szczepanek).jpg?width=200 "Linnaeus]], is the type species for the genus ''[[Bufo]]''")
![dorsal]] and 2) ventral aspect of holotype,<br>3) dorsal and 4) ventral aspect of paratype](https://commons.wikimedia.org/wiki/Special:FilePath/JamidesEliotiMUpUnAC1.jpg?width=200 "dorsal]] and 2) ventral aspect of holotype,<br>3) dorsal and 4) ventral aspect of paratype")
![Type illustration of ''[[Mormopterus acetabulosus]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Mormopterus acetabulosus type illustration.jpg?width=200 "Type illustration of ''[[Mormopterus acetabulosus]]''")
ANCHORING POINT (OF A NAME) IN TAXONOMY
Type specimen; Neotype; Biological types; Lectotype; Type (botany); Type (zoology); Botanical type; Clonotype; Type locality (biology); Type material; Paralectotype; Typus; Onomatophore; Cotype; Biological type; Hapantotype; Type specimens; Types in zoology; Type location (biology); Type illustration; Locality (biology); Type-specimen; Orthotype; Isoneotype; Plastotype; Isolectotype; Iconotype; Type series; Neotypification; Lectotypification; Ergatotype; Lectotype specimen; Type host; Typetaxon; Type (taxonomy); Series of type specimens; Hypotype
In biology, a type is a particular [(or in some cases a group of specimens) of an organism] to which the [[scientific name of that organism is formally attached. In other words, a type is an example that serves to anchor or centralize the defining features of that particular taxon.
Wikipedia
Irregular variable
An irregular variable is a type of variable star in which variations in brightness show no regular periodicity. There are two main sub-types of irregular variable: eruptive and pulsating.
Eruptive irregular variables are divided into three categories:
- Group I variables are split into subgroups IA (spectral types O to A) and IB (spectral types F through M).
- Orion variables, GCVS type IN (irregular and nebulous), indigenous to star-forming regions, may vary by several magnitudes with rapid changes of up to 1 magnitude in 1 to 10 days, are similarly divided by spectral type into subgroups INA and INB, but with the addition of another subgroup, INT, for T Tauri stars, or INT(YY) for YY Orionis stars.
- The third category of eruptive irregulars are the IS stars, which show rapid variations of 0.5 to 1 magnitude in a few hours or days; again, these come in subgroups ISA and ISB.
Pulsating irregular giants or supergiants, called slow irregular variables, are all of late spectral types (K, M, C, or S), and classed as type L-LB for giants and LC for supergiants. How many of these are actually semi-regular variables that simply need more study, remains unclear.
