Engineering, 04.11.2019 22:31, Isaiahtate053
Let even = {hm, xi | m is a turing machine that runs on input x for an even number of steps}. of course, a turing machine running for infinitely many steps neither runs for an odd nor an even number of steps. we want to show that even is undecidable by a proof from scratch (i. e., by diagonalization not by a reduction). first we assume even is decidable, i. e., there is a tm h that accepts hm, xi if m is a turing machine that runs on input x for an even number of steps, and rejects otherwise. we want to do the diagonalization in two stages.
(a) first, describe a tm dĖ (based on the supposedly existing tm h) accepting hmi if and only if m is a turing machine that runs on input hmi for an even number of steps. otherwise dĖ rejects. note that you may assume the correctness of the church-turing thesis, i. e., instead of describing a turing machine in detail, you can just describe an algorithm in pseudoācode.
(b) now define a tm d from dĖ that runs on hmi for an odd number of steps if dĖ accepts hmi. otherwise d runs for an even number of steps.
(c) how does the existence of this produce a contradiction?
(d) what does the contradiction prove?
Answers: 1
Engineering, 03.07.2019 15:10, breannaasmith1122
Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.
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Engineering, 04.07.2019 18:10, lillygrl100
For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 Ā°f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater
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Engineering, 04.07.2019 18:10, siri5645
At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.
Answers: 1
Let even = {hm, xi | m is a turing machine that runs on input x for an even number of steps}. of cou...
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