physics, mathematical physics, philosophy of physics
theory (physics), model (physics)
experiment, measurement, computable physics
Axiomatizations
Tools
Structural phenomena
Types of quantum field thories
In principle, any interaction between two physical systems is a measurement, whereby each system measures the state of the other. In practice, we break the symmetry by treating one system as the real physical system of study and the other system as merely a measuring apparatus with the sole purpose of measuring . If the properties of are more directly observable than those of , then this is useful.
Last revised on May 19, 2019 at 14:05:49. See the history of this page for a list of all contributions to it.