2019年9月14日 · Thus "h-bar" is no different myth, no matter how reliable it sounds. A very valid question is who introduced the h-bar notation. Since h-bar is also called Dirac h, I checked his …

2015年5月8日 · When was the reduced planck constant $\hbar= h/2\pi$ first introduced and what was the reason behind introducing such a constant?

2019年10月3日 · In another question, I was asking about the origin of the reduced Planck's constant, $\hbar \equiv \frac{h}{2 \pi} .$ Specifically, I wanted to know why the symbol $`` \hbar …

2025年1月2日 · Friedman, H. (1973). ... Bar-Hillel and Levy give a bit more in their [1973, pp. 28, 871. They argue that ...

2017年11月15日 · Max Jammer in The conceptual development of Qm, 1967, (chap. 5.2) has a written a dozen page history about operators, an idea that was developped in the study of …

In complex geometry, there is the a lemma, analogous to the Poincaré lemma in (real) differential geometry, which states that a $(p,q)$-form that is $\bar\partial$-closed is locally $\bar\partial$ …

$\def\Target#1{\rlap{\smash{\label{#1}\phantom{\tag{#1}}}}}$ **_tl;dr_-** It's unclear. The symbol $`` \hbar "$ itself wasn't anything new. [Paul Dirac](https://en ...

William Playfair was a Scottish engineer and economist, who invented the pie and bar charts as well as the line graph, which have all played an indubitably ubiquitous role in modern statistics. …

2025年1月22日 · Is bar notation more intuitive or universally understood in certain contexts? Does it have origins tied to specific mathematicians or periods in history? I understand that both …

2016年9月5日 · Why not merge the lower bar of the Delta with the upper bar of the equal sign, to save some ink, and create a lighter symbol? References: the symbol itself was already …