Question: Show that the following languages are undecidable: D = { M | M is a Turing machine and M never overwrites a non - blank

Show that the following languages are undecidable:

D

= {

M

|

M is a Turing machine and M never overwrites a non

-

blank symbol with the blank symbol on any input

} .

E

= {

M

,

q

|

M is a Turing machine and M never enters the state q on any input

}

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