How can Turing complete machines exist theoretically if the halting problem is undecidable

As the question says, if I input on the tape of a Turing complete machine a program that solves the halting problem with the correct inputs the program will never end its execution regardless of memory and time. Isn’t the halting problem a computational problem that can’t be executed by a Turing complete machine so that it’s halts sometime?

Does a spell exist that makes a targeted object desirable to others?

I’m looking for a Pathfinder spell, but I don’t even know if the spell I’m thinking of even exists.

Basic premise of the spell is that the object which the spell is cast on has an aura of desirability for anyone who failed their save (most likely will). So whatever the spell is cast on should become something that someone really really wants.

So if the desired (heh) spell doesn’t exist, I would like to actually make the spell.

Would a store or shop exist in the ethereal plane in 5e?

Would it make any kind of sense to have a store or shop that can only be found in the ethereal plane? Do the rules as written not permit that? I’ve read the sections in the DMG and PHB about it, but it still seems a bit fuzzy.

My idea was to have my players stumble upon a shady purveyor of magic items who does his business in the ethereal plane to avoid the prying eyes of authorities.

Follow up question: would the astral plane make any more sense? To me, that seems less feasible, but you never know.

Update: The players were transported via a modified version of the Cubic Gate from the DMG. I imagine this merchant having the ability to shift to the ethereal innately (right now I envision him as some kind of fiend) and he carries an item or two with him when he travels there.

Would a store or shop exist in the ethereal plane in 5e?

Would it make any kind of sense to have a store or shop that can only be found in the ethereal plane? Do the rules as written not permit that? I’ve read the sections in the DMG and PHB about it, but it still seems a bit fuzzy.

My idea was to have my players stumble upon a shady purveyor of magic items who does his business in the ethereal plane to avoid the prying eyes of authorities.

Follow up question: would the astral plane make any more sense? To me, that seems less feasible, but you never know.

Update: The players were transported via a modified version of the Cubic Gate from the DMG. I imagine this merchant having the ability to shift to the ethereal innately (right now I envision him as some kind of fiend) and he carries an item or two with him when he travels there.

Would a store or shop exist in the ethereal plane in 5e?

Would it make any kind of sense to have a store or shop that can only be found in the ethereal plane? Do the rules as written not permit that? I’ve read the sections in the DMG and PHB about it, but it still seems a bit fuzzy.

My idea was to have my players stumble upon a shady purveyor of magic items who does his business in the ethereal plane to avoid the prying eyes of authorities.

Follow up question: would the astral plane make any more sense? To me, that seems less feasible, but you never know.

Update: The players were transported via a modified version of the Cubic Gate from the DMG. I imagine this merchant having the ability to shift to the ethereal innately (right now I envision him as some kind of fiend) and he carries an item or two with him when he travels there.

Is this problem well-known and what solutions exist?

Here is the problem:

Input:

  • A series of source/sink nodes at fixed positions with given outwards/inwards flow

  • The total source and sink flow match

  • A concave cost function that gives a cost per edge in terms of flow capacity

Expected output:

  • The minimum costing graph (not necessarily fully connected) that connects all sources to sinks and permits the required flow, without creating extra nodes.

Therefore the network topology is unspecified and should be optimized.

Many thanks.

error 1932 table doesn’t exist in engine xampp

I am using Xampp in my local pc. My mysql wasn’t running, It was closing after starting, I was looking for some answers and found an answer in this forum and thought it would solve the problem. (link is here) . But it has worsen my problem. Now mysql is opening, but seeing another error: #1932 – Table doesn’t exist in engine. Now i am unable to do anything to all my databases. Can anyone point me out what goes wrong! and give me a solution!

Note: My Xampp version is v3.2.4

Does topological sort exist for any complete directed acyclic graph?

Let’s assume that DAG is complete: there is directed edge among every to nodes. Does topological sort of vertices exist for any such graph? I.e. is it possible to make linear list of nodes in which the left node has edge into the right node. Maybe this is the question about existence of Hamiltonian path in every complete DAG?

What to do when a player wishes for magic not to exist? [closed]

The question is simple, the answer… not so much. My player has access to a wish spell, and he has decided to wish for magic not to exist, on all planes, from the current time, forever. If I grant his wish, what happens? Can I grant his wish?

I should note that while I am aware that I can choose for nothing to happen, I do want something to happen, even if it is not the intended result.