Talk:Quantum theory of observation/Quantum theory for beginners

Cooperation and discussion
A reader who wants to cooperate on the content of the book shall always give reasons in the discussion page. The modifications have to be justified. A reader who only gives a few words in the comment of the edit, gives a bad sign. It suggests that he or she doesn't want to discuss.

Here is my discussion of the last edits :

The formula connects four of the most important numbers. To connect types of numbers is not clear. What does it mean?

$$e$$ and $$\pi$$ are not any irrational numbers, they are the most important transcendental ones. $$i$$ is not any imaginary number, it is the most fundamental one. -1 is not any whole number, it is one of the three most fundamental ones: -1, 0 and 1. All that is point of view neutral. It is basic mathematics. Several standard textbooks present it in this way, or a variation, 5 of the most important numbers : $$e^{i2\pi}=1$$

--TD (discuss • contribs) 10:38, 10 July 2018 (UTC)

Complex numbers and spin
To IndigoHatter,

it is true that quantum spin is of fundamental importance to understand the role of complex numbers in quantum mechanics. The Bloch sphere for spin one-half is particularly illuminating. But spin is not so fundamental. There is a quantum theory of quantum particles without spin, and it makes use of complex numbers, like any quantum theory. Thank you for your interest. TD (discuss • contribs) 20:04, 31 January 2023 (UTC)