As they say, a comathematician is a device for turning cotheorems into ffee. If you’re interested in vectors/tensors, the relevant Wikipedia page is https://en

As they say, a comathematician is a device for turning cotheorems into ffee. If you’re interested in vectors/tensors, the relevant Wikipedia page is https://en.wikipedia.org/wiki/Covariance_and_contravariance_of_vectors https://en.wikipedia.org/wiki/Covariance_and_contravariance_...