In game theory, an information set is a set that, for a particular player, establishes all the possible moves that could have taken place in the game so far, given what that player has observed so far. If the game has perfect information, every information set contains only one member, namely the point actually reached at that stage of the game. Otherwise, it is the case that some players cannot be sure exactly what has taken place so far in the game and what there position is. Game theory is a branch of applied mathematics that uses models to study interactions with formalised incentive structures (games). It has applications in a variety of fields, including economics, international relations, evolutionary biology, political science, and military strategy. ... Perfect information is a term used in economics and game theory to describe a state of complete knowledge that is available to all market participants, or players, and that is instantaneously updated as new information arises. ...
More specifically, in a game tree, an information set is a set of decision nodes such that: An extensive form game is a specification of a game in game theory. ...
Every node in the set belongs to one player.
When play reaches the information set, the player with the move cannot differentiate between nodes within the information set, i.e. if the information set contains more than one node, the player to whom that set belongs does not know which node in the set has been reached.
The informationset of an XML document is defined to be the one obtained by parsing it according to the rules of the specification whose version corresponds to that of the document.
Informationsets may be constructed by other means, for example by use of an API such as the DOM or by transforming an existing informationset.
This may not be true of an informationset constructed by other means; in such a case there will be no XML document corresponding to the informationset, and to serialize it will require resolution of the inconsistencies (for example, by outputting namespace declarations that correspond to the namespaces in scope).
Set formed part of the Ennead of Heliopolis, as a son of the earth (Geb) and sky (Nut), husband to the fertile land around the Nile (Nephthys), and brother to death (Ausare/Osiris), and life (Isis).
In art, Set was mostly depicted as a mysterious and unknown creature, referred to by Egyptologists as the Set animal or Typhonic beast, with a curved snout, square ears, forked tail, and canine body, or sometimes as a human with only the head of the Set animal.
Set is one of the main characters in the Roger Zelazny novel Creatures of Light and Darkness.
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