Ciro Santilli @cirosantilli 37

This is one of the most canonical examples of "Cult leader Jesus tries to divert faith from an old religion into his own".

Upside: superconducting above 92K, which is above the 77K of liquid nitrogen, and therefore much much cheaper to obtain and maintain than liquid helium.

Downside: it is brittle, so how do you make wires out of it? Still, can already be used in certain circuits, e.g. high temperature SQUID devices.

Metric space but where the distance between two distinct points can be zero.

Notable example: Minkowski space.

First we write a vector field as:Note how we are denoting each component of $F$ as $F^i$ with a raised index.

Then, the divergence can be written in Einstein notation as:

It is common to just omit the variables of the function, so we tend to just say:or equivalently when referring just to the operator:

TODO confirm, but looks like it, e.g. E. Coli starts DNA replication before the previous one finished.

No, but why?