I actually removed that alternative, as the most "obviously not". Despite the fact that I also have problems with "this bus route is serviced every twenty minutes or more" (like... every two hours? That's more than 20 minutes.)[1].
That's just a syncope of "more often". I agree that that one is literally ambiguous, though. I'm not denying the possibility of ambiguity, as you seem to think, I'm just saying you're going out of your way to read some statements as ambiguous by drawing alternative interpretations that don't even make grammatical sense.
Well, in this case, to mean two hours, you should have said "every twenty or more minutes", but I'd allow that one.
That's really the thing in general. You don't seem to be able to allow for the fact that language is flexible, but not totally arbitrary. Your supposedly misleading interpretations for the cases I've objected to are
not possible under ordinarily understood English grammar. For example, it is not possible that a comparator like "25% less" or whatever could be referring to an unspecified previous reduction rather than an absolute reference point, because for it to mean that, it would have had to have been specified.
It doesn't. "There were ten cars and lorries on that road" means ten vehicles that were each either a car or a lorry, not ten of each. I didn't write "25 'A+B's". But clearly such language (or even pseudo-lingustic notation) is ambiguously misinterpretable. Which was my point, albeit described in language which can be... ambiguously misinterpreted?
If you say that there are ten cars and trucks on the road, you are not using any multiplication. The sentence is operating purely in the realm of addition. If you said there were ten times as many cars and trucks on the road as yesterday, you would not mean that there were five times as many cars and two times as many trucks - that would be stupid. You would mean that all cars and trucks have been multiplied by ten.
Look, I'm sorry, but this is like an ongoing problem I've noticed. Your symbolic reasoning seems to be noticeably weak. You just casually equivocated between counting things and multiplying them with no apparent awareness of the difference. I don't know how to explain these things in less abstract terms for you.
Well, Celsius (and several other scales) did actually start off "measuring coldness", partly due to finding cold, hard water (especially) a more tangible manifestation of temperature than its hotter phases and the method of translating temperature-dependant expansions of materials via a useful method of display. The Delisle scale remains (due to not much use, in the years since the 'positivity' of heat was established) pretty much the only one not flipped round. I rather like the Delisle scale!
But that's negation, not reciprical (a better example that creeps into the real world might be Mhos as the counterpart to Ohms).
Right, that's... not what I'm talking about. Maybe look up thermodynamic beta.
And, to further confuse us, gives us statements such as "it's twice as cold today". e.g. -5°C => -10°C? But that's 268K => 263K, not 134K. And if you prefer to deal in °F, that's starting at 23ish, so... maybe instead halve it to a far colder 11.5°F? Or are we talking a range of C° (or F°, or Re°, or Rø°, or De°; luckily, in this regard, it doesn't actually matter much which) twice as much below a separately implied standard temperature[2] as the one we're comparing to? (Same sort of problems with "twice as hot", of course. Likely to be very scale-dependent as to the meaning.)
Probably better just avoiding "twice as cold", although something now sitting at "half as many Kelvin" probably is special enough for the people involved knowing how best to make sure everyone knows what that means, whether we're talking now liquified 'gas' or a not quite so energetic a solar plasma. (With no good example in the mid-range where both before-and-after are really within easy human experience... the ice forming around a Yellowstone geyser in the depths of winter?)
I mean, talking about something being twice as cold only makes sense on an absolute scale, yes. If someone said that 64° real numbers is twice as warm as 32°, that would obviously just be wrong and make no sense, because it's neither physically twice as warm in terms of thermodynamic temperature, nor subjectively twice as warm to typical human sensation. (Incidentally, for most human sensation, subjective feelings of multipliedness generally follow a log scale, like with sound - where 20dB feels twice as loud as 10, etc.; I don't know of any research applying this to heat but it would not surprise me if the same thing applied.)
But that doesn't mean that the multiple is undefinable, it just means that it's not something that's likely to be useful in anyone's day to day life. But thermodynamically, something is twice as cold as something else if its thermodynamic beta is twice that of the other one. There is still a
clearly defined meaning.
[1] And then there's the seemingly attractive "Across the store: Up to 50% discount!". ie. "never less than half price, but most/all things could still be full price without making us liars". Whereas I always wonder whether I can challenge "Up to 50% off" as 'clearly' "Up to (50% off)" rather than "(Up to 50%) off", to try to get something below half price, rather than above.
Okay, but you see how this is clearly not ambiguous, right? Your "Up to (50% off)" is grammatically impossible, and this
always means that up to, but no more than, half may be discounted, not that prices might be up to half of what they would otherwise be. What you're arguing is the equivalent of complaining that "the cat ate the mouse" is ambiguous because it contains the same WORDS as "the mouse ate the cat". The phrase would have to be rewritten in a different order to mean that in English.
[2] Which? The one the day before the -5°C? Room temperature? Body temerature?
Again, you can't invent a referent out of nowhere that wasn't specified. It's just against the rules.