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[Shades]

Try to build a floor across the lowest level of a magma pipe.

after reducing the pipe to 1 level in depth (not including the 'bottom' off the map level)
water + mining = floor capped pipe

[Lav]

Try to build a floor across the lowest level of a magma pipe.

That should be relatively easy. You'll have to expose the lowest level and pour water on it. After it solidifies into obsidian - mine it and you have a floor.

P. S. I was slow, Shades beat me on this one. :-)

[Mraedis]

Build. Not dig, build.

[Shades]

Build. Not dig, build.

carve away the whole bottom z-layer (or a lot of it), dumping excess magma into a chasm. This means magma bubbling up will randomly flow around as depth 1 and evaporate if it leaves the main pipe giving you time to slowly, and with much !!death!! build floor tiles over it.

I imagine the last few tiles will be the hardest, I can't recall how fast magma refills.

[Lav]

Build. Not dig, build.

Dig. Then build. Voila, you have a built floor. :-)

[Retro]

As far as I can tell, anything in DF is possible so long as you have the space (and in some situations, enough natural walls for collapsing). Aside from that, it's just a matter of time and effort.

[denito]

Unless my memory betrays me, they survive the drop without problems.

Whoa...  Are you implying that if I have an aquifer at Z level -2 and I needed it to be at Z level -5 to properly drain an ocean, I could use a cave in to drop a 3x3 section down 3 levels, and when it lands I could mine out the middle tile and it would still be an infinite water sink?

[Shades]

Whoa...  Are you implying that if I have an aquifer at Z level -2 and I needed it to be at Z level -5 to properly drain an ocean, I could use a cave in to drop a 3x3 section down 3 levels, and when it lands I could mine out the middle tile and it would still be an infinite water sink?

I can just imagine the Fun in attempting to disconnect a section of aquifer on all sides and the bottom without drowning all your miners over and over.

Sounds like a plan to me.

[Lav]

Whoa...  Are you implying that if I have an aquifer at Z level -2 and I needed it to be at Z level -5 to properly drain an ocean, I could use a cave in to drop a 3x3 section down 3 levels, and when it lands I could mine out the middle tile and it would still be an infinite water sink?

No, I'm implying that's just a hunch from my memory. I may very easily be wrong.

[Sphalerite]

I know that you can't build downwards, so in theory if you had a map whose entire bottom was open chasm tiles with a few empty Z-levels above them, you could never build anything in those empty Z-levels.  I don't think it's possible to ever have terrain like that without some tweak utility however.  I also don't know if the sides of the map count as support, or if the entire map would just instantly fall into the chasm.

[Graebeard]

OP, are you trying to figure out whether DF is an ω-consistent recursive class of formulas, and identify a proposition that is undecidable based upon said formulas?

[Lemunde]

If the game spawns a cat in an unrevealed magma pool, the cat is both alive and dead and possibly undead.

[Innominate]

If the game spawns a cat in an unrevealed magma pool, the cat is both alive and dead and possibly undead.

At least until you check the unit list for deceased units.

[Lav]

OP, are you trying to figure out whether DF is an ω-consistent recursive class of formulas, and identify a proposition that is undecidable based upon said formulas?

I forgot the university math long ago, but you are probably right. :-)