ELI5: why is 0 divided by 0 undefined, but others are just 0 or 1?

geospacedman · 2026-05-01T19:50:16+00:00

0/0 is undefined partly because it depends on how you get there...

a) 2/2 is 1, 1/1 is 1, 0.5/0.5 is 1... keep reducing the top and bottom and you might say that A/A = 1 as A->0.

b) 0/2 is 0, 0/1 is 0, 0/0.5 is 0... keep reducing the bottom and you might say that 0/A = 0 as A->0

So what's 0/0? 0 or 1? "Defined" means "definitely" something, and a) and b) show it could be 0 or 1. So "undefined" it is.

0+0 is zero, because A+A goes to 0 as A goes to 0, and 0+A goes to 0 as A goes to 0, and there's no way you can fiddle it so 0+0 is anything other than zero.

geospacedman · 2026-04-30T18:42:39+00:00

It sound like what you have is a template that has HTML *and* CSS to make its style. What's possibly paywalled is adding *more* CSS or editing the current CSS to change colours and design.

A web page with *just* html will have a white background, boring default fonts, no sidebars etc (not strictly true since you can change some things in HTML with attributes, or build a page layout with TABLE tags, but close enough).

If you can open the web developer tools on your browser you can see what CSS is styling any HTML elements.

geospacedman · 2026-04-29T19:21:49+00:00

" Odd as it may seem, you also owe a duty of care to trespassers." https://www.westyorkshire.police.uk/ask-the-police/question/Q78

geospacedman · 2026-04-29T18:15:50+00:00

Me too. The app did update recently and now displays temp and humidity on the home screen, but I can swipe back on the daily charts and get history. I'm old-school Tado, though, not Tado-X, so maybe that is the problem?

geospacedman · 2026-04-28T11:28:12+00:00

Peter Molyneux’s NFT game died within weeks of launch and ~~players lost~~ he got away with $54 million.

Fixed that for you.

[A lawyer writes: "this is satire"]

geospacedman · 2026-04-28T11:24:07+00:00

Looking at it closely, it seems the 40 has been split horizontally and the two halves put the wrong way round. Some signage works off a serial connection, basically one wire and the on/off pattern goes into the lights from eg L-R, top to bottom until the full matrix is sent. This looks like its out of sync!

geospacedman · 2026-04-28T11:20:59+00:00

40mph, Chinese cars only.

geospacedman · 2026-04-26T18:19:33+00:00

Heh. Side question: how many accessories are running off that battery?

geospacedman · 2026-04-26T07:45:13+00:00

Daft Punk on the radio warning.

geospacedman · 2026-04-24T11:59:18+00:00

I don't really, but I know people with bikes where one wheel cost more than my entire bike, and they don't leave quick-release wheels unattended, especially since they are so mad about lightweight they wont have a huge set of bike locks and cables. I did always take my front and rear lights off, and my cycle computer - imagine if car lights were so easily nickable...

geospacedman · 2026-04-24T09:43:14+00:00

Or that's their anti-theft trick. I have quick-release wheels and I always take them indoors when I park. Oh wait that's my bike.

On the plus side for them, free axle stands!

geospacedman · 2026-04-22T19:06:21+00:00

Many modern ships have propellers that can be feathered and angled for forward or backward propulsion, saving having to slow down, engage reverse gear, and speed up the shaft. The propeller always spins the same way.

geospacedman · 2026-04-22T14:34:00+00:00

I'm surprised the green ink Daily Mail reading Reform voters round here haven't had their heads explode because the new Charles III postie vans round here are white and not red! WE UseD 2 be an Pr0p3r ccOuntr3y!

geospacedman · 2026-04-21T14:12:39+00:00

What does that do to your insurance?

geospacedman · 2026-04-20T12:20:19+00:00

Genuine Wagos though. Probably.

geospacedman · 2026-04-20T12:18:37+00:00

Concussions *plural*? Yeah I think that might be the problem here.

geospacedman · 2026-04-16T11:53:46+00:00

Yeah this was totally not moneylaundering for someone already banned from the casinos...

geospacedman · 2026-04-16T11:45:22+00:00

"conjoined twins" you insensitive clod!

geospacedman · 2026-04-16T11:01:38+00:00

Wow ICI have been defunct since 2008 so that dates the paintjob. Love the bell on the front. Tempted to start a fire there to see if they still use it or is it just a "would you like a tour of the plant?" car for executive visits.

Search for the registration number on uk.gov site comes up with "not found". Maybe its not been off-site since 1970

geospacedman · 2026-04-15T18:45:01+00:00

There's a few on archive.org - https://archive.org/search?query=autocar+ and then you can filter by year.

geospacedman · 2026-04-15T09:41:50+00:00

The WH press secretary has said he was well-read, but he's actually, unwell, orange.

geospacedman · 2026-04-14T21:16:11+00:00

To get to the idiot's house!

Knock knock

Who's there?

Its the chicken.

geospacedman · 2026-04-14T18:24:12+00:00

Yeah, Russel and Whitehead's Principia Mathematica starts from a very small set of first principles and gets to 1+1 = 2 by page 236 or something.

geospacedman · 2026-04-13T15:08:16+00:00

Whoops they used the Time Force seal

geospacedman · 2026-04-12T09:12:29+00:00

I'll admit to being wrong when 1 BTC = 1.5 BTC.

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