Mt. Gox Updated 2025-07-16
The first Bitcoin exchange. Coded as a hack, and they didn't manage to fix the hacks as the site evolved in a major way, which led to massive hacks.
Their creation is clearly visible on the archive history of bitcoin.org: web.archive.org/web/20100701000000*/bitcoin.org which started having massively more archives since Mt. Gox opened.
Video 1.
One Mistake Brought Down This FBI Most Wanted Hacker by Crumb (2023)
. Source. Good overview of Mt. Gox.
One parameter subgroup Updated 2025-07-16
The one parameter subgroup of a Lie group for a given element of its Lie algebra is a subgroup of given by:
Intuitively, is a direction, and is how far we move along a given direction. This intuition is especially vivid in for example in the case of the Lie algebra of , the rotation group.
One parameter subgroups can be seen as the continuous analogue to the cycle of an element of a group.
Softcover (LaTeX) Updated 2025-07-16
LaTeX subset that output nicely to HTML.
Too insane though due to LaTeX roots, better just move to newer HTML-first markups like OurBigBook Markup or markdown.
Wikidata Updated 2025-07-16
Cyc Updated 2025-07-16
Dense and sparse matrices Updated 2025-07-16
A good definition is that the sparse matrix has non-zero entries proportional the number of rows. Therefore this is Big O notation less than something that has non zero entries. Of course, this only makes sense when generalizing to larger and larger matrices, otherwise we could take the constant of proportionality very high for one specific matrix.
Of course, this only makes sense when generalizing to larger and larger matrices, otherwise we could take the constant of proportionality very high for one specific matrix.
FTX Updated 2025-07-16
ITER Updated 2025-07-16
LevelDB Updated 2025-07-16
One "LevelDB" database contains multiple file in a directory. Off the bat inferior to SQLite which stores everything in a single file!
Wikipedia mentions quoting his Nobel Prize biography:
In Monod's studies he discovered that the course work was decades behind the current biological science. He learned from other students a little older than himself, rather than from the faculty.
Depth of a quantum circuit Updated 2025-07-16
This is an important metric, because it takes some time for the quantum operations to propagate, and so the depth of a circuit gives you an idea of how long the coherence time a hardware needs to support a given circuit.

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