Lemann Center Updated 2025-07-16
norm sequence convergence does not imply pointwise convergence Updated 2025-07-16
Nazi Germany Updated 2025-07-16
How to use an Oxford Nanopore MinION to extract DNA from river water and determine which bacteria live in it Sequencing Updated 2025-07-16
PBS Space Time Updated 2025-07-16
Alps Updated 2025-07-16
Chinese government Updated 2025-07-16
Chinese policy Updated 2025-07-16
Git implementation Updated 2025-07-16
Git internals Updated 2025-07-16
Jeremy O'Brien Updated 2025-07-16
Single page application Updated 2025-07-16
Limits of gel electrophoresis Updated 2025-07-16
Parallel evolution Updated 2025-07-16
The cool thing about parallel evolution is that it shows how complex phenotype can evolve from very different initial genetic conditions, highlighting the great power of evolution.
Amateur telescope Updated 2025-07-16
Noisy-channel coding theorem Updated 2025-07-16
Setting: you are sending bits through a communication channel, each bit has a random probability of getting flipped, and so you use some error correction code to achieve some minimal error, at the expense of longer messages.
This theorem sets an upper bound on how efficient you can be in your encoding, for any encoding.
The next big question, which the theorem does not cover is how to construct codes that reach or approach the limit. Important such codes include:
But besides this, there is also the practical consideration of if you can encode/decode fast enough to keep up with the coded bandwidth given your hardware capabilities.
news.mit.edu/2010/gallager-codes-0121 explains how turbo codes were first reached without a very good mathematical proof behind them, but were still revolutionary in experimental performance, e.g. turbo codes were used in 3G/4G.
But this motivated researchers to find other such algorithms that they would be able to prove things about, and so they rediscovered the much earlier low-density parity-check code, which had been published in the 60's but was forgotten, partially because it was computationally expensive.
Perihelion precession of Mercury Updated 2025-07-16
Subtle is the Lord by Abraham Pais (1982) page 22 mentions that when Einstein saw this in 1915, he was so excited he couldn't work for three days.
No-Nonsense Quantum Field Theory by Jakob Schwichtenberg (2020) Updated 2025-07-16
This book really tries to recall basic things to ensure that the reader will be able to understand the more advanced ones.
But Ciro Santilli really prefers it when authors error on the side of obvious.
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