THE SMART TRICK OF PRODUCT THAT NOBODY IS DISCUSSING

base exponent foundation electrical power = \displaystyle \scriptstyle \left. \start matrix \scriptstyle \text foundation ^ \text exponent \\\scriptstyle \textual content base ^ \textual content power \finish matrix \right\ \,=\, during which bV and bW denote the bases of V and W, and vi denotes the element of v on bVi, and Einstein summation conv