𝝐ᵢⱼₖ : The cube shaped 3D matrix secretly powering determinants, curls and vector products
Did you know that you can calculate determinants of matrices by matrix multiplication alone? No need to memorise the weird formula, just learn how to multiply cube matrices with square ones like you multiply square matrices with line matrices!
This video talks about 3X3X3 matrices, the Levi-Civita symbol and the immediate use case in calculating cross/vector products.
You have already been using this 3D matrix implicitly!