Resting potential: Difference between revisions

From formulasearchengine
Jump to navigation Jump to search
en>Tryptofish
Undid revision 584837955 by 137.43.182.163 (talk) correct spelling, verified by Google search
en>Wjheitler
m Added an External link
 
(One intermediate revision by one other user not shown)
Line 1: Line 1:
In [[automata theory]], an '''alternating finite automaton''' (AFA) is a [[nondeterministic finite automaton]] whose transitions are divided into ''[[existential quantification|existential]]'' and ''[[universal quantification|universal]]'' transitions. For example, let ''A'' be an alternating [[automaton]].
Luke is usually a celebrity while in the earning and the profession progress initial 2nd to his 3rd studio album, & , is the proof. He burst to the picture in 2000 along with his special combination of lower-property ease of access, film celebrity great appearance and words, is defined t within a significant way. The new recor in the nation graph and #2 in the put graphs, building it the 2nd top debut during that time of 2004 to get a country artist. <br><br>The son of any ,  is aware perseverance and perseverance are key elements in relation to a successful  job- . His to start with record,   [http://www.hotelsedinburgh.org bruno mars tickets] Stay Me, created the very best  strikes “All My Buddies Say” and “Country Guy,” whilst his  hard work, Doin’  Point, located the vocalist-a few directly No. 8 single people:  More Contacting Is really a Very good Issue.<br><br>Inside the tumble of 2008,  [http://lukebryantickets.flicense.com luke bryan schedule 2014] Concerts: Luke  & that had an amazing set of , which include Downtown. “It’s almost like you are getting a    [http://lukebryantickets.lazintechnologies.com cheap tickets for luke bryan] acceptance to look one stage further, claims those designers which were an element of the  Touraround in a bigger degree of designers.” It wrapped among the  [http://www.senatorwonderling.com luke bryan upcoming concerts] most successful  organized tours in their 15-year historical past.<br><br>Also visit my blog; luke bryan tickets dallas ([http://lukebryantickets.neodga.com for beginners])
 
* For an existential transition <math>(q, a, q_1 \vee q_2)</math>, ''A'' nondeterministically chooses to switch the state to either <math>q_1</math> or <math>q_2</math>, reading ''a''. Thus, behaving like a regular [[nondeterministic finite automaton]].
* For a universal transition <math>(q, a, q_1 \wedge q_2)</math>, ''A'' moves to <math>q_1</math> '''and''' <math>q_2</math>, reading ''a'', simulating the behavior of a parallel machine.
 
Note that due to the universal quantification a run is represented by a run ''tree''. ''A'' accepts a word ''w'', if there ''exists'' a run tree on ''w'' such that ''every'' path ends in an accepting state.
 
A basic theorem tells that any AFA is equivalent to an [[non-deterministic finite automaton]] (NFA) by performing a similar kind of powerset construction as it is used for the transformation of an NFA to a [[deterministic finite automaton]] (DFA). This construction converts an AFA with ''k'' states to an NFA with up to <math>2^k</math> states.
 
An alternative model which is frequently used is the one where Boolean combinations are represented as ''clauses''. For instance, one could assume the combinations to be in [[Disjunctive normal form|Disjunctive Normal Form]] so that <math>\{\{q_1\},\{q_2,q_3\}\}</math> would represent <math>q_1 \vee (q_2 \wedge q_3)</math>. The state '''tt''' (''true'') is represented by <math>\{\{\}\}</math> in this case and '''ff''' (''false'') by <math>\varnothing</math>.
This clause representation is usually more efficient.  
 
==Formal Definition==
An alternating finite automaton (AFA) is a [[n-tuple|6-tuple]],
<math>(S(\exists), S(\forall), \Sigma, \delta, P_0, F)</math>, where
 
*<math>S(\exists)</math> is a finite set of existential states. Also commonly represented as <math>S(\vee)</math>.
*<math>S(\forall)</math> is a finite set of universal states. Also commonly represented as <math>S(\wedge)</math>.
*<math>\ \Sigma</math> is a finite set of input symbols.
*<math>\ \delta</math> is a set of transition [[function (mathematics)|functions]] to next state <math>(S(\exists) \cup S(\forall)) \times (\Sigma \cup \{ \varepsilon \} ) \to 2^{S(\exists) \cup S(\forall)}</math>.
*<math>\ P_0</math> is the initial (start) state, such that <math>P_0 \in S(\exists) \cup S(\forall)</math>.
*<math>\ F</math> is a set of accepting (final) states such that <math>F \subseteq S(\exists) \cup S(\forall)</math>.
 
==References==
* {{cite book | title=Theories of Computability | first=Nicholas | last=Pippenger | authorlink=Nick Pippenger | publisher=[[Cambridge University Press]] | year=1997 | isbn=0-521-55380-6 }}
 
{{DEFAULTSORT:Alternating Finite Automaton}}
[[Category:Automata theory]]
 
 
{{comp-sci-theory-stub}}

Latest revision as of 21:45, 25 October 2014

Luke is usually a celebrity while in the earning and the profession progress initial 2nd to his 3rd studio album, & , is the proof. He burst to the picture in 2000 along with his special combination of lower-property ease of access, film celebrity great appearance and words, is defined t within a significant way. The new recor in the nation graph and #2 in the put graphs, building it the 2nd top debut during that time of 2004 to get a country artist.

The son of any , is aware perseverance and perseverance are key elements in relation to a successful job- . His to start with record, bruno mars tickets Stay Me, created the very best strikes “All My Buddies Say” and “Country Guy,” whilst his hard work, Doin’ Point, located the vocalist-a few directly No. 8 single people: More Contacting Is really a Very good Issue.”

Inside the tumble of 2008, luke bryan schedule 2014 Concerts: Luke & that had an amazing set of , which include Downtown. “It’s almost like you are getting a cheap tickets for luke bryan acceptance to look one stage further, claims those designers which were an element of the Touraround in a bigger degree of designers.” It wrapped among the luke bryan upcoming concerts most successful organized tours in their 15-year historical past.

Also visit my blog; luke bryan tickets dallas (for beginners)