# Logical arrow of time, 6.4.3

Logical arrow of time, 6.1.3

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The source of the macroscopic time asymmetry, aka the second law of thermodynamics, is the difference between prediction and retrodiction.

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In a prediction, the deduction direction is the same as the physical/observer time direction.

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In a retrodiction, the deduction direction is opposite to the physical/observer time direction.

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In other words:

In a prediction, the meta-time direction is the same as the object-time direction.

In a retrodiction, the meta-time direction is opposite to the object-time direction.

— Me@2022-02-18 06:52:27 AM

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— guess —

If a retrodiction is done by a time-opposite observer, he will see the entropy increasing. For him, he is really making a prediction.

— guess

— Me@2013-10-25 3:33 AM

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How to create a time-inverted observer?

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Just invert the retrodiction direction.

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Retrodiction to a backward-time observer is just equivalent to retrodiction-for-backward-time to a forward-time observer.

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However, retrodiction-for-backward-time is just prediction.

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In other words, retrodiction to a backward-time observer is equivalent to a prediction for a normal time direction observer.

That’s why

— guess —

If a retrodiction is done by a time-opposite observer, he will see the entropy increasing. For him, he is really making a prediction.

— guess

— Me@2013-10-25 3:33 AM

— Me@2022-02-18 06:37:59 AM

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