\Upsilon

The Greek letter Upsilon (\Upsilon) is used in mathematics and science to represent various concepts, such as a type of particle in physics or a variable in equations.

Examples

Decay of an Upsilon particle into an electron-positron pair

\Upsilon \to e^+ e^-

Summation notation using Upsilon as the variable

\Upsilon = \sum_{i=1}^{n} x_i

Second partial derivative in tensor notation

\Upsilon_{ij} = \frac{\partial^2 \phi}{\partial x_i \partial x_j}