turing-machine

What's a Turing machine?

What is a Turing machine and why do people keep mentioning it? My IBM PC is all I need to do my computation! Why does anyone care about these machines? ...

Where can I find sample automata and turing machines?

I'm studying for an automata test on a course that's heavily based on jflap. Trouble is we don't have much documentation and the sample automata that I've found on jlap like this and this, are insufficient to prepare for the upcoming test. Where can I find more? Any other resource with sample turing machines shown as graphs with transi...

Would relational calculus be Turing-complete if it allowed unsafe queries?

My understanding about Codd's concept of "safe queries" was created to ensure that a query would always terminate. One key ability of a Turing machine is that it can work on infinite calculations (and thus isn't guaranteed to terminate). If the safe query restriction were removed, would relational calculus be Turing-complete since that...