an introductory #logic #textbook by P.D. Magnus
https://www.fecundity.com/logic/download.html
Along with #dark #energy, dark #matter represents a major embarrassment for #physicists. Together, these two unknowns mean that over 95 per cent 📊 of the #universe is made up of stuff not #categorised 📉 in the #standard model of #particle #physics, our best theoretical picture of #material #reality https://www.newscientist.com/definition/dark-matter
https://en.wikipedia.org/wiki/I_know_that_I_know_nothing
Picture : https://commons.wikimedia.org/wiki/File:Pedra_Azul_Milky_Way.jpg
Mother
Pink Floyd
Track 6 on The Wall
https://genius.com/Pink-floyd-mother-lyrics
This is one of my favorite pictures. It feels like it was taken yesterday… but it was taken in a Paris public garden nearly a hundred years ago. Everything feels modern: the composition, the casualness, the daring clothes, haircuts, and accessories.
The colors are original: this is an #autochrome, using the first process for color #photography invented by the Lumière brothers in 1903.
The women are unknown, but I can't help wondering how they fared a few years later in nazi-occupied Paris.
On how old is our universe, and what's its size, the Hubble Constant and a Cosmic dilemma, and how the Universe’s dark-matter dominated structures have formed over the eons of time -- check out the University of Hawai'i News on the publication of the Cosmicflows-4 Catalog: https://hawaii.edu/news/2022/09/26/map-galaxies-largest-ever-catalog
research paper: https://arxiv.org/abs/2209.11238
#universe #cosmology #galaxies #darkmatter #hubble #hubbleconstant #expansion #bigbang #bigbangtheory #astronomy #astrophysics #physics #space #science #cosmos
The map of the observable Universe
https://mapoftheuniverse.net/
> This project is called the Sloan Digital Sky Survey
> Observations were conducted using a dedicated 2.5-m wide-angle optical telescope at Apache Point Observatory in New Mexico
@freemo
Yeah, all burners, high heat, closed lid. Like a rocket... 🙃 😉 🤣
Couldn't help it and did this last night. I'm still in awe at the level of detail in this image! Look at those spiral dust lanes.
For more details about this image and the new ERIS instrument at ESO's Very Large Telescope: https://www.eso.org/public/announcements/ann22015/
@Pat
Sudden Death of Entanglement
https://arxiv.org/abs/0910.1396
@Pat
If no ESD (entanglement sudden death) occurs; if there's no decoherence due to interaction with the environment (ex., some measurement is made); if none of the particles decay; the entanglement can last indefinitely.
An Ancient Geometry Problem Falls to New Mathematical Techniques https://www.quantamagazine.org/an-ancient-geometry-problem-falls-to-new-mathematical-techniques-20220208/ #geometry #maths #math #mathematics #history #science #ancient
Source: https://twitter.com/QuantaMagazine/status/1594762087577927681?s=20&t=IeXEP1scFFUyzHPCynVTiQ
Describe myself in 5 tag words:
#mathfolk #programmer #reader #traveller #researcher
header: Cobalt Mirror (Lake Louise), photo by Paul Zizka