# Forcing

Forcing may refer to:

• Forcing (set theory), a technique for obtaining proofs in set theory
• Forcing (recursion theory)
• Radiative forcing, the difference between the incoming radiation energy and the outgoing radiation energy in a given climate system
• Cloud forcing, the difference between the radiation budget components for average cloud conditions and cloud-free conditions
• Forcing (magic), a technique by which a magician forces one outcome from a card draw
• Forcing, driving a harmonic oscillator at a particular frequency

### Other articles related to "forcing":

Martin's Maximum
... by Foreman, Magidor Shelah (1988), is a generalization of the proper forcing axiom, which is in turn a generalization of Martin's axiom ... if D is a collection of dense subsets of a notion of forcing that preserves stationary subsets of ω1, then there is a D-generic filter ... It is a well known fact that forcing with a ccc notion of forcing preserves stationary subsets of ω1, thus MM extends MA ...
List Of Forcing Notions - Cohen Forcing
... In Cohen forcing (named after Paul Cohen) P is the set of functions from a finite subset of ω2 × ω to {0,1} and p < q if p q ... Forcing with this poset adds ω2 distinct reals to the model this was the poset used by Cohen in his original proof of the independence of the continuum hypothesis ...
Laver Function - Applications
... forcing notion (P, ≤) such after forcing with (P, ≤) the following holds κ is supercompact and remains supercompact after forcing with any κ-directed closed forcing ... other applications, for example the proof of the consistency of the proper forcing axiom ...
Blackout Convention - Variation
... scheme After a reverse, the cheaper of fourth suit and 2NT is forcing, showing a relatively weak hand ... of responder's suit would be cheaper than fourth suit then it is non-forcing ... Other bids are natural and game forcing ...

### Famous quotes containing the word forcing:

Already determined dawn began to lay
In place across a cloud the slender ray
For prying beneath and forcing the lids of sight,
And loosing the pent-up music of overnight.
Robert Frost (1874–1963)

It is quite true, as some poets said, that the God who created man must have had a sinister sense of humor, creating him a reasonable being, yet forcing him to take this ridiculous posture, and driving him with blind craving for this ridiculous performance.
—D.H. (David Herbert)

An empty head is not really empty; it is stuffed with rubbish. Hence the difficulty of forcing anything into an empty head.
Eric Hoffer (1902–1983)