Ciro Santilli @cirosantilli 37

Convergence: math.stackexchange.com/questions/629630/simple-proof-euler-mascheroni-gamma-constant

Same value if you swap any input arguments.

The bioinformatics database: www.ncbi.nlm.nih.gov/

Here's a good example of what you can get out of it: E. Coli K-12 MG1655

Related: en.wikipedia.org/wiki/Protein_(nutrient)

In plain English: the space has no visible holes. If you start walking less and less on each step, you always converge to something that also falls in the space.

One notable example where completeness matters: Lebesgue integral of $L^p$ is complete but Riemann isn't.

When it exists, which is not for all matrices, only invertible matrix, the inverse is denoted:

Ahh, this dude is just like Ciro Santilli, trying to create the ultimate natural sciences encyclopedia!

____
In 1995, Weisstein converted a Microsoft Word document of over 200 pages to hypertext format and uploaded it to his webspace at Caltech under the title Eric's Treasure Trove of Sciences.
____