U

U-figure

Ultra-sound

Undamped system

Undetermined multiplier

Uniform boundary conditions

Uniform circular motion, decomposed into two pendulum oscillations

Uniform continuity

Uniform Continuity of Continuous Functions, theorem

Uniform convergence

Uniform Convergence

Uniform growth

Uniform Growth of straight line

Uniform motion

Unique factorization

Unique inverse

Uniquely factorizable

Unit element

Unit matrix

unit matrix

Unit of electromotoric force

Unit of heat

Unit of length

Unit of mass

Unit of potential difference

Unit of time

Unit of velocity

Unit of work

Unit poles in plane and space

Unit Source

Unit source

Unit sphere, n-dimensional

Unit vector

Unit-heat-source

Unities

Units of length

Unit-vector

Unknowns

Unscaled power method

Unstable equilibrium

Upper bound of absolute error

Upper semi-continuous

Upper sums

Useful effect of reversible process

Uselessness of too many digits