denotational

The OP, or the Abseil docs?

The delayed-choice quantum eraser wasn’t carried out experimentally until 1999, so I think it’s a bit misleading to say this is what makes the double-slit experiment (first carried out with matter in 1927) so weird.

For me, the weird thing about the double-slit experiment for matter is that the excitations of the detector are discrete, i.e. we see individual particles arriving at the detector, as expected under the classical model of matter behaving like particles.

It’s only when we send many particles over time, that we can tell that we’ve been sampling from a distribution given by the interfering wave-functions.

This suggests that the particle is interfering with itself, thus behaving like a wave, but since we only detect each particle in a single place, it’s still behaving like a particle in some sense.

This is very different from the classical wave phenomena seen when we do the double-slit experiment in a water tank, where there is constant interference across the whole axis the whole time (there is no particle-like behaviour at all).

> the usual garbage undergrad textbooks

Out of interest, please could you give some examples of textbooks you consider garbage, and some you consider not to be (undergrad or otherwise)?

Fair enough: I was reading the original comment as referring to (thermal) noise intrinsic to the amplifier design itself (as opposed to noise due to imperfections in DC supply or due to coupling with some external transmitter), but this makes more sense, and we should consider the whole system anyway.

I see, so you want to band-limit the noise, and are willing to accept potentially raising the noise floor in the band-limited range, the idea being that if the original noise is sufficiently broad-band, this will still increase SNR?

Off-topic, but can an RC circuit really reduce noise? I can see how it would reduce distortion (which is not the same as noise), but adding passives is surely going to increase thermal noise?

> Yes -- in set theory sets can contain themselves

Which set theory? ZFC doesn't permit this.

Non-well-founded set theories are so non-standard that I think it's wrong, or at least misleading, to claim that unqualified "set theory" permits this.

Has anyone looked at using greywater for evaporative cooling? I couldn’t find much after a quick Google, aside from small scale domestic usage.

Given the “rightsholders” have no rights over OpenTTD (only the assets are copyrightable, and OpenTTD has had its own set of open-source assets for the past 15 years), I can’t agree with this.

I’m not sure how to interpret this other than Atari not wanting to compete with OpenTTD on Steam.

> On another occasion much later, I learned by chance that putting certain provocative information on a security clearance form can greatly speed up the clearance process. But that is another story.

Presumably this is the famous (?) story of him listing his race as “mongrel” whenever asked?