Dreaded_Anomaly comments on Rationality Quotes August 2011 - Less Wrong

3 Post author: dvasya 02 August 2011 08:24PM

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Comment author: DanielLC 06 August 2011 12:09:05AM 1 point [-]

Not really. I have a reaction like that to non-Euclidean geometry, but I don't know many things it can be used for.

Comment author: Dreaded_Anomaly 06 August 2011 02:24:26AM 2 points [-]

Non-Euclidean geometry is essential to the theory of general relativity, which is of immense use in astronomy and also allows the GPS system to function accurately.

Comment author: DanielLC 06 August 2011 04:34:52AM *  1 point [-]

Non-Euclidean geometry is essential to the theory of general relativity, which is of immense use in astronomy

What is astronomy used for?

and also allows the GPS system to function accurately.

General relativity does. Non-Euclidean geometry does not. I'm pretty certain you can approximate it well enough with Euclidean geometry. Gravitational time dilation is just a function of hight.

Also, GPSs already work. There's no need for me to use non-Euclidean geometry.

Finally, that was just an example. If someone is interested in pure mathematics, and there's an application for it, it's just a coincidence. I've heard some mathematicians actually go as far as disliking it when people find applications for there work.

Comment author: Dreaded_Anomaly 06 August 2011 04:57:48AM *  2 points [-]

What is astronomy used for?

Studying the territory improves the map.

General relativity does. Non-Euclidean geometry does not. I'm pretty certain you can approximate it well enough with Euclidean geometry. Gravitational time dilation is just a function of hight.

No, that is not the case. The spacetime geometry near the Earth is non-Euclidean, and using a Euclidean approximation does not produce the required accuracy.

Finally, that was just an example. If someone is interested in pure mathematics, and there's an application for it, it's just a coincidence. I've heard some mathematicians actually go as far as disliking it when people find applications for there work.

You are conflating "value" with "applications." Different people see value in different things for different reasons.