Kostas Maistrelis

Noether’s theorem is important not only for physics but also for the ontological picture it suggests. If Lagrangian mechanics¹ describes the world and the action of a system has the appropriate symmetries, then energy, linear momentum, and angular momentum are not independent primitive entities: they are defined through their relation to time, space, and rotations. This connection makes appealing the idea that what is fundamental is not only individual things but also the structure of their relations, a thought akin to structural realism, though the theorem by itself does not prove it.

Statistics on the course of the COVID-19 pandemic in Greece and a comparison with other countries.

In the comparisons between countries, the figures are expressed as percentages of each country's total population rather than as absolute numbers.
This approach allows more meaningful comparisons, since the absolute numbers of countries with different populations are not directly comparable to one another.

A series of (R Markdown) lessons built step by step: first the concept of the derivative as a rate of change, then exponential population growth via a differential equation, and finally the logistic equation when space and resources impose limits. Best read in order.

Quite a few statistics and probability textbooks with an introduction to the normal distribution have passed through my hands. They almost always started with the mathematical definition and moved on to the properties and uses of the distribution. For a long time I had not found a book that explained how this formula came about — until at some point a book called Lady Luck fell into my hands which, although old, is a very good introduction to the subject of probability, and in it I found the first clear description of how the normal distribution arises.