Cumulative concept of time, 6

Why is the past the necessary condition for the present?

1 = {1}, 2 = {1,2}, …

one = {first}, two = {first, second}, …

e.g. a necessary condition of having 3 apples is having 2 apples.

— Me@2011.07.05

— Me@2011.07.29

長生不死

2011.07.28 Thursday ACHK

— Me@2011.07.28

Cumulative concept of time, 5

“Tomorrow” has two possible meanings,

e.g. “tomorrow’s blog” can refer to

the blog posts written on tomorrow

or

the total blog posts you have tomorrow.

— Me@2011.07.05

意念可樂 2.1

「當什麼人都不給我工作時，我就知道，我是一個偉大的藝術家：在生的時候是不會獲得應得的尊重。  – 黃子華」

— Me@2011.07.27

– 黃子華

一矢中的

— Me@2011.07.26

To be sure of hitting the target, shoot first and call whatever you hit the target.

– Ashleigh Brilliant

Free will, 4.2

In a sense, a human is a macroscopic quantum-coherent object.

A human’s mind lies in a box: planck spacetime box.

A free will uses macroscopic laws until meeting other free wills.

— Me@2011.07.04

— Me@2011.07.26

好為人師 2

（安：有人說過，不要好為人師。但是，我發覺我偏偏好為人師。我應怎樣改掉這壞習慣呢？）

「好為人師」未必是壞習慣。那要視乎你教人的目的，主要是為了教導別人，還是為了表現自己。

— Me@2010.11.26

— Me@2011.07.25

— Me@2011.07.24

Free will, 4.1

In a sense, human is a macroscopic coherent quantum system.

A human action manifests a decision, which collapses a quantum wavefunction.

— Me@2011.07.04

— Me@2011.07.23

— Me@2011.07.22

知行習覺

Knowing –> Action –> Habit –> Instinct

— Me@2011.07.22

T-symmetry 7

Time reversal of the known dynamical laws

Particle physics codified the basic laws of dynamics into the standard model. This is formulated as a quantum field theory that has CPT symmetry, i.e., the laws are invariant under simultaneous operation of time reversal, parity and charge conjugation. However, time reversal itself is seen not to be a symmetry (this is usually called CP violation). There are two possible origins of this asymmetry, one through the mixing of different flavours of quarks in their weak decays, the second through a direct CP violation in strong interactions. The first is seen in experiments, the second is strongly constrained by the non-observation of the EDM of a neutron.

It is important to stress that this time reversal violation is unrelated to the second law of thermodynamics, because due to the conservation of the CPT symmetry, the effect of time reversal is to rename particles as antiparticles and vice versa. Thus the second law of thermodynamics is thought to originate in the initial conditions in the universe.

— Wikipedia on T-symmetry

2011.07.22 Friday ACHK

好為人師

（安：有人說過，不要好為人師。但是，我發覺我偏偏好為人師。我應怎樣改掉這壞習慣呢？）

— Me@2010.07.19

— Me@2011.07.21

魔法筆記 2.1

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— Me@2011.07.20

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Another way of dealing with Loschmidt’s paradox is to see the second law as an expression of a set of boundary conditions, in which our universe’s time coordinate has a low-entropy starting point: the Big Bang.

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2011.07.20 Wednesday ACHK

— Me@2011.07.16

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靈感天線 2

— Me@2011.07.19

Sometimes, a great idea is just a few good ideas meeting for the first time.

T-symmetry 6

In kinetic theory in physics, molecular chaos is the assumption that the velocities of colliding particles are uncorrelated, and independent of position. This assumption, also called in the writings of Boltzmann the Stosszahlansatz (collision number hypothesis), makes many calculations tractable.

In particular, the assumption of molecular chaos was a key element, although initially unrecognised, in Boltzmann’s H-theorem of 1872, which attempted to use kinetic theory to show that the entropy of a gas prepared in a state of less than complete disorder must inevitably increase, as the gas molecules are allowed to collide.

This drew the objection from Loschmidt that it should not be possible to deduce an irreversible process from time-symmetric dynamics and a time-symmetric formalism: something must be wrong (Loschmidt’s paradox).

The resolution (1895) of this paradox is that the velocities of two particles after a collision are no longer truly uncorrelated. By asserting that it was acceptable to ignore these correlations in the population at times after the initial time, Boltzmann had introduced an element of time asymmetry through the formalism of his calculation.

— Wikipedia on Molecular chaos

2011.07.18 Monday ACHK

主觀世界 2

R4 3

Language

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The limit of my language is the limit of my world.

– Ludwig Wittgenstein

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– Me@2009.02.10

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