Replacement of master and slave terminology from technology Updated 2025-07-16
The IETF was a notable one: www.nytimes.com/2021/04/13/technology/racist-computer-engineering-terms-ietf.html
- developers.google.com/style/word-list (archive) Google's avoid word list is a masterclass in 2020's political correctness
Condensed matter university course Updated 2025-07-16
Multiplication Updated 2025-07-16
Resonance Updated 2025-07-16
Examples:
- mechanical resonance, notably:
- pipe instruments
- electronic oscillators, notably:
- LC oscillator, and notably the lossy version RLC circuit
Perhaps a key insight of resonance is that the reonant any lossy system tends to look like the resonance frequency quite quickly even if the initial condition is not the resonant condition itself, because everything that is not the resonant frequency interferes destructively and becomes noise. Some examples of that:
- striking a bell or drum can be modelled by applying an impuse to the system
- playing a pipe instrument comes down to blowing a piece that vibrates randomly, and then leads the pipe to vibrate mostly in the resonant frequency. Likely the same applies to bowed string instruments, the bow must be creating a random vibration.
- playing a plucked string instrument comes down to initializing the system to an triangular wave form and then letting it evolve. TODO find a simulation of that!
Another cool aspect of resonance is that it was kind of the motivation for de Broglie hypothesis, as de Broglie was kind of thinking that electroncs might show discrete jumps on atomic spectra because of constructive interference.
Reverse transcriptase Updated 2025-07-16
Converts RNA to DNA, i.e. the inverse of transcription. Found in viruses such as Retrovirus, which includes e.g. HIV.
Ridiculous cases of political correctness censorship Updated 2025-07-16
- Stack Exchange's censorship of "I think Trump is disgusting as a person" from Ciro Santilli's profile: cirosantilli.com/china-dictatorship/sstack-overflow-forbids-criticizing-the-character-of-genocidal-political-leaders-like-xi-jinping
HIV Updated 2025-07-16
Messenger RNA Updated 2025-07-16
Pretty Much Physics Updated 2025-07-16
Four-momentum Updated 2025-07-16
Square Updated 2025-07-16
Synchrotron Updated 2025-07-16
Most important application: produce X-rays for X-ray crystallography.
Note however that the big experiments at CERN, like the Large Hadron Collider, are also synchrotrons.
List of facilities: en.wikipedia.org/wiki/List_of_synchrotron_radiation_facilities
Fundamental theorem on homomorphisms Updated 2025-07-16
Sponsor Ciro Santilli's work on OurBigBook.com Taxation Updated 2025-07-16
Ciro Santilli is a UK resident. He will register as a "solo trader" (slightly funny legal term) and treat donations that he uses for projects as grants, which pay regular income tax:
The rates are given at: www.gov.uk/income-tax-rates and are as of writing:
- 0 - £12,570 0%
- £12,571 - £50,270: 20%
- £50,271 - to £125,140: 40%
- £125,140: 45%
National insurance is also likely going to be paid: www.gov.uk/self-employed-national-insurance-rates:
Fortunately however VAT does not need to be paid.
The amount that will be declared is the same as he grant amount that was requested, e.g. if 100k USD is requested for 1 year, then 100k USD will be pro-rata declared on that year.
Any remaining donations that don't yet meet specific grant goals will be initially treated as cash gifts which pay no tax. If in the future they are used as grant money after further goal amounts are reached, then they will taxed as grants.
Note however that if the donor is UK-based and dies within 7 years of the gift being given, inheritance tax has to be paid on them as per: www.gov.uk/inheritance-tax/gifts, at a maximum of 32% and going to to 0% at 7 years, so let me know from the afterlife.
Ciro's Edict #4 Updated 2025-07-16
Ciro's Edict #4 Enable reference features into ourbigbook.com Updated 2025-07-16
Camera obscura Updated 2025-07-16
Cartesian product Updated 2025-07-16
Galois theory Updated 2025-07-16
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