Nabla symbol by Ciro Santilli 35 Updated +Created
As if Greek letters weren't enough, physicists and mathematicians also like to make up tons of symbols, some of which look like the could actually be Greek letters!
Nabla is one of those: it was completely made up in modern times, and just happens to look like an inverted upper case delta to make things even more confusing!
Nabla means "harp" in Greek, which looks like the symbol.
Applications of the Fourier series by Ciro Santilli 35 Updated +Created
Formal system by Ciro Santilli 35 Updated +Created
NeoCarbonFood by Ciro Santilli 35 Updated +Created
Previously known as "Food From Electricity", "NeoCarbonFood" sounds like a more commercializable version of it.
Uses electricity to electrolyse water into hydrogen and oxygen molecules, and then use bacteria that do hydrogen chemosynthesis to convert it into food.
Endurance athlete by Ciro Santilli 35 Updated +Created
Electronic lab equipment by Ciro Santilli 35 Updated +Created
Video 1.
A Perfect Electronics Bench? by Keysight (2021)
Source.
Electronics bibliography by Ciro Santilli 35 Updated +Created
List of e-learning websites by Ciro Santilli 35 Updated +Created
Dirac delta function by Ciro Santilli 35 Updated +Created
The "0-width" pulse distribution that integrates to a step.
There's not way to describe it as a classical function, making it the most important example of a distribution.
Applications:
Ordinary differential equation by Ciro Santilli 35 Updated +Created
ZIP (file format) by Ciro Santilli 35 Updated +Created
Oncogene by Ciro Santilli 35 Updated +Created
Saint Seiya by Ciro Santilli 35 Updated +Created
This was THE craze thing in Brazil before Pokemon, it was shown from 1994 to 1997. In particular the collectible action figures! It was possibly more popular in Brazil than e.g. in the US: www.quora.com/Why-was-Saint-Seiya-so-popular-in-Brazil
The thing as quite violent, rated for 14-year olds, but no one gave a fuck, 7 yo Ciro was happily watching it. We protect children too much.
That series also had quite a religious feel to it (as obviously suggested by the series English name itself). It must also have been a great motivator to getting young kids into astronomy!
Ciro's favorite character was definitely Andromeda Shun. He was smart and thoughtful, and had the coolest most complex weapon: his chain whips. He's also a bit effeminate, with his pink clothing and a gentle way. Perhaps that is the reason for adult Ciro's mild fascination with the Andromeda Galaxy.
The English name is horrendous... the Portuguese/French name is so much better: Knights of the Zodiac! Saying this in English just reminded Ciro Santilli of the Zodiac Killer. But nevermind.
Open source analog-to-digital converter by Ciro Santilli 35 Updated +Created
Video 1.
Open Source 8.5 Digit Voltmeter from CERN by Marco Reps (2021)
Source.
Hippolyte Pixii by Ciro Santilli 35 Updated +Created
Stationary action principle by Ciro Santilli 35 Updated +Created
As mentioned on the Wikipedia page en.wikipedia.org/w/index.php?title=Stationary_Action_Principle&oldid=1020413171, "principle of least action" is not accurate since it could not necessarily be a minima, we could just be in a saddle-point.
Open access by Ciro Santilli 35 Updated +Created
Metamath by Ciro Santilli 35 Updated +Created
Publishing by Ciro Santilli 35 Updated +Created

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