# Azimuth

### About Azimuth

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- Allan Erskine
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- Article published: Measures of trajectory ensemble disparity in nonequilibrium statistical dynamics | Gavin E. Crooks
- Blake Stacey
- Boris Borcic
- Classical Mechanics versus Thermodynamics (Part 1) « Azimuth
- Classical Mechanics versus Thermodynamics (Part 1) « Azimuth
- Classical Mechanics versus Thermodynamics (Part 2) « Azimuth
- Curtis Faith
- David
- David Corfield
- David Roberts
- dcorfield
- demian cho
- Eric
- G.R.L. Cowan, hydrogen-energy fan until ~1996
- Giampiero Campa
- Gregory Benford
- Hudson Luce
- Jacob Biamonte
- jim stasheff
- John Baez
- John Huerta
- Jon Rowlands
- JVK
- Lance Martin
- Luminous Pretense
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- randform » Blog Archive » mini nuclear wastes
- Robert Smart
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### Authors

### Description

John Baez, physicist, writes on ecology and mathematical physics.

### Azimuth's Latest Posts

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This time we use the principle of minimum power to determine what a circuit made of resistors actually does. Its ‘behavior’ is described by a functor sending circuits to linear relations between the potentials and currents at the input and output terminals. We call this the ‘black box’ functor, since it takes a circuit: […]

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Okay, today we will look at the ‘black box functor’ for circuits made of resistors. Very roughly, this takes a circuit made of resistors with some inputs and outputs: and puts a ‘black box’ around it: forgetting the internal details of the circuit and remembering only how the it behaves as viewed from outside. As […]

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This time I explain more about how ‘cospans’ represent gadgets with two ends, an input end and an output end: I describe how to glue such gadgets together by composing cospans. We compose cospans using a category-theoretic construction called a ‘pushout’, so I also explain pushouts. At the end, I explain how this gives […]

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This time I’d like to compare a different paper on climate networks: • Y. Berezin, A. Gozolchiani, O. Guez and S. Havlin, Stability of climate networks with time, Scientific Reports 2 (2012). The goal of this paper is to see how stable over time climate networks over time. They divide the world into 9 zones: […]

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This time I’d like to compare a different paper on climate networks: • Y. Berezin, A. Gozolchiani, O. Guez and S. Havlin, Stability of climate networks with time, Scientific Reports 2 (2012). The goal of this paper is to see how stable over time climate networks over time. They divide the world into 9 zones: […]

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