## Cross Product (Definition)

` $$ \boldsymbol{a} ~\times~ \boldsymbol{b} ~=~ \begin{bmatrix} a_2b_3-a_3b_2 \\ a_3b_1-a_1b_3 \\ a_1b_2-a_2b_1 \end{bmatrix} $$ `

Learn the arts of numbers, logical definitions, and constructed abstract structures, as well as their relationships to each other, which will help you better master physics.

` $$ x_1 ~=~ - \frac{\class{red}{p}}{2} ~+~ \sqrt{ \left( \frac{\class{red}{p}}{2} \right)^2 ~-~ \class{blue}{q}} $$ `

Learn set theory in a simple way: subset, intersection, union, difference, etc. using examples and Venn diagrams.

Here you will learn what divergence of a vector field is and what it has to do with electric charges as sources and sinks.

Illustrated overview of all geometric solids with important properties as well as formulas for areas, volumes and other quantities.

` $$ V ~=~ a \, b\, c $$ `

` $$ A ~=~ \class{blue}{a} \, \class{red}{h} $$ `

Here you will learn by example what the difference is between the partial derivative and the total derivative.