Position (poker)
Position in poker refers to the order in which players are seated around the table and the related poker strategy implications. Players who act first are in "early position"; players who act later are in "late position"; players who act in between are in "middle position". A player "has position" on opponents acting before him and is "out of position" to opponents acting after him. Because players act in clockwise order, a player "has position" on opponents seated to his right, except when the opponent has the button and certain cases in the first betting round of games with blinds.
Position in Texas hold 'em
The primary advantage held by a player in late position is that he will have more information with which to make better decisions than players in early position, who will have to act first, without the benefit of this extra information. This advantage has led to many players in heads-up play raising on the button with an extremely wide range of hands because of this positional advantage. Also, as earlier opponents fold, the probability of a hand being the best goes up as the number of opponents goes down.
Position
Position refers to the spatial location (rather than orientation) of an entity. The term may also refer to:
Science and mathematics
Humanities, law and economics
Games and recreation
Human activity
- Position (obstetrics), the orientation of a baby prior to birth
- Positions of the feet in ballet
- Position (music), the location of the hand on a musical instrument
- Proprioception, the sense of the relative position of neighbouring parts of the body
- Asana (yoga), the location and posture of the body while practicing yoga
- Sex position, the arrangement of bodies during sexual intercourse
Position operator
In quantum mechanics, the position operator is the operator that corresponds to the position observable of a particle. The eigenvalue of the operator is the position vector of the particle.
Introduction
In one dimension, the square modulus of the wave function, 
, represents the probability density of finding the particle at position 
. Hence the expected value of a measurement of the position of the particle is
Accordingly, the quantum mechanical operator corresponding to position is 
, where
The circumflex over the x on the left side indicates an operator, so that this equation may be read The result of the operator x acting on any function ψ(x) equals x multiplied by ψ(x). Or more simply, the operator x multiplies any function ψ(x) by x.
Eigenstates
The eigenfunctions of the position operator, represented in position space, are Dirac delta functions.
To show this, suppose that 
is an eigenstate of the position operator with eigenvalue 
. We write the eigenvalue equation in position coordinates,
Position (finance)
In financial trading, a position is a binding commitment to buy or sell a given amount of financial instruments, such as securities, currencies or commodities, for a given price.
The term "position" is also used in the context of finance for the amount of securities or commodities held by a person, firm, or institution, and for the ownership status of a person's or institution's investments.
Trading and financial assets
In derivatives trading or for financial instruments, the concept of a position is used extensively. There are two basic types of position: a long and a short.
Traded options will be used in the following explanations. The same principle applies for futures and other securities. For simplicity, only one contract is being traded in these examples.
Long position
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