# determined+by+no+rule+or+principle

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**Cramer's rule**— In linear algebra, Cramer s rule is a theorem, which gives an expression for the solution of a system of linear equations with as many equations as unknowns, valid in those cases where there is a unique solution. The solution is expressed in… …12

**Anthropic principle**— In astrophysics and cosmology, the anthropic principle is the philosophical argument that observations of the physical Universe must be compatible with the conscious life that observes it. Some proponents of the argument reason that it explains… …13

**Mailbox rule**— The mailbox rule (called the postal rule or postal acceptance rule in the UK, Australia and New Zealand, or deposited acceptance rule ) is a term of common law contracts which determines the timing of acceptance of an offer when mail is… …14

**Uncertainty principle**— In quantum physics, the Heisenberg uncertainty principle states that locating a particle in a small region of space makes the momentum of the particle uncertain; and conversely, that measuring the momentum of a particle precisely makes the… …15

**Born alive rule**— The born alive rule is a legal principle that holds that various aspects of the criminal law, such as the statutes relating to homicide and to assault, apply only to a child that is born alive . Recent advances in the state of medical science… …16

**Lesser of two evils principle**— The lesser of two evils principle, also known simply as the lesser evil, is the idea that of two bad choices, one isn t as bad as the other, and should be chosen over the one that is a greater threat. Some people consider the lesser of two evils… …17

**Bernoulli's principle**— This article is about Bernoulli s principle and Bernoulli s equation in fluid dynamics. For Bernoulli s Theorem (probability), see Law of large numbers. For an unrelated topic in ordinary differential equations, see Bernoulli differential… …18

**Slide rule**— For other uses, see Slide rule (disambiguation). A typical ten inch student slide rule (Pickett N902 T simplex trig). The slide rule, also known colloquially as a slipstick,[1] is a mechanical analog computer. The slide rule is used primarily for …19

**Right-hand rule**— For the related yet different principle relating to electromagnetic coils, see right hand grip rule .In mathematics and physics, the right hand rule is a common mnemonic for understanding notation conventions for vectors in 3 dimensions. It was… …20

**Posting rule**— The posting rule (or mailbox rule in the U.S., or postal rule or deposited acceptance rule ) is an exception to the general rule of contract law in common law countries that acceptance takes place when communicated. The posting rule states, by… …