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> By chopping off a head we strictly decrease the ordinal. Because there are no infinite strictly descending sequences of ordinals, the hydra will eventually die, no matter how you chop off heads.

Well there you go.

ypercubeᵀᴹ

@PaulWhite Did you expect that, before reading the solution?

Paul White

@ypercubeᵀᴹ Of course not! LOL.

ypercubeᵀᴹ

7:44 PM

@PaulWhite Tempted to add a 3rd ;)

Paul White

@ypercubeᵀᴹ Yeah why not, you already added an edit as a comment, let's see if we can get it on the HNQ and really make my day :)

I kid btw.

The thing is it's fine if you do. Quality answers would justify the question.

Paul White

8:04 PM

Ha. It'll be recursion next

ypercubeᵀᴹ

@PaulWhite yeah

@PaulWhite compared to this one, it should go to HNQ:

Q: How many elves does Santa need to enslave to make toys for the kids?

Santa keeps his elves under horrid, appalling conditions. Working everyday of the year for little pay in the freezing cold of the North Pole. But just how many elves does he need? How many elves would it take to build enough toys for 2+ billion boys and girls across the world?

Paul White

I'm scared to click. On phone now is that on hnq?

ypercubeᵀᴹ

Yes it is. That's how I found it!

Paul White

Omg the DBA question hit hnq

So glad my shift is over

Tom V

@PaulWhite which one?

oh the 1000+ columns

sheesh

ypercubeᵀᴹ

8:13 PM

I see the Duplicate as well on the HNQ list, on the right side ;)

Paul White

8:25 PM

Yeah I meant the duplicate rows one

ypercubeᵀᴹ

@PaulWhite I see it on the right side (when I refresh enough times) but not on the official HNQ link: stackexchange.com/questions

The 1100 columns one is there though ...

Paul White

@ypercubeᵀᴹ definitely appears on the app. I like the grouping sets a lot

Introduce duplicates by grouping

Mathematically counterintuitive ;)

ypercubeᵀᴹ

@PaulWhite haha, yeah

@PaulWhite as a coincidence(?), the first example at MSDN technet.microsoft.com/en-us/library/bb510427(v=sql.105).aspx

> GROUPING SETS Equivalent of UNION ALL

(or Technet). Do they change these names often, too?

Paul White

8:51 PM

There have been two libraries with overlapping content for as long as I can remember. Probably related to the MSDN and TexhNet subscription options. The latter has been discontinued but I doubt the links will go away

Philᵀᴹ

9:02 PM

@ypercubeᵀᴹ just fancied some C++. Done too much Python lately

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