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p^~=|phi_i(x)><phi_i(t)| (1) p^~sum_(j)c_j|phi_j(t)>=c_i|phi_i(x)> (2) sum_(i)|phi_i(x)><phi_i(x)|=1. (3)

In general, the opposite of trivial.

A set class which is not a set.

A superset which is not the entire set.

A very useful active feedback method for controlling things like temperature control systems, servo motors, and flow control valves.

If a is (directly) proportional to b, then a/b is a constant. The relationship is written a proportional b, which implies a=cb, for some constant c known as the constant of ...

A ruled semicircle used for measuring and drawing angles.

Combine the two above squares on the left into the single large square on the right.

In the American system, 10^(15).

An m-ary n-ic polynomial (i.e., a homogeneous polynomial with constant coefficients of degree n in m independent variables).