## Can Turing machine go into infinite loop?

**No Turing machine can infallibly tell in advance if another Turing machine will get stuck in an infinite loop on some given input**.

## Can a Turing machine have an infinite alphabet?

The question is whether the alphabet will always allow this. The basic issue is that a finite alphabet is presented in its entirety (so we can choose to define our functions recursively), but **an infinite alphabet can never be presented in its entirety**.

## Is Turing machine finite or infinite?

A Turing machine is a **finite state machine** plus a tape memory. Each transition may be accompanied by an operation on the tape (move, read, write). Its total possible configurations is arbitrarily large, regardless of the size of the program; it expands towards infinity.

## Which component of a Turing machine is infinite?

A Turing machine consists of (a) a finite control, (b) **one tape**, representing the memory, that has a left margin and is divided into an infinite number of cells, and (c) a moving read/write head.

## What is Turing complete programming language?

Turing Complete refers to a machine that, given enough time and memory along with the necessary instructions, can solve any computational problem, no matter how complex. The term is normally used to describe modern programming languages as most of them are Turing Complete (**C++, Python, JavaScript**, etc.).

## What is the difference between a decidable language and a Turing recognizable language?

A language is said to be Decidable if there is a Machine that will accept strings in the language and reject strings not in the language. **A Language is called Turing Recognizable if some Turing Machine recognizes it**. A Language is called Turing Decidable if some Turing Machine decides it.

## Which models have an infinite input alphabet?

Thus we note that infinite alphabets naturally lead us to infinite state systems, whose space of configurations is infinite. The theory of computation is rich in such models: **pushdown systems, Petri nets, vector addition systems, Turing machines** etc.

## What are the techniques for Turing machine construction?

A Turing machine can make space on its tape by **shifting all nonblank symbols a finite number of cells to the right**. To do so, the tape head must make an excursion to the right, repeatedly storing the symbols read in its finite control and replacing them with symbols read from cells to the left.

## How do you solve Turing machine problems?

Construct a TM machine for checking the palindrome of the string of odd length. Solution: Firstly we read the first symbol from left and then we compare it with the first symbol from right to check whether it is the same. Again we compare the second symbol from left with the second symbol from right.

## How did the Turing machine break Enigma?

**Cracking the code**

This machine was able to use logic to decipher the encrypted messages produced by the Enigma. However, it was human understanding that enabled the real breakthroughs. The Bletchley Park team made educated guesses at certain words the message would contain.

## Did Alan Turing really break the Enigma code?

As early as 1943 Turing’s machines were cracking a staggering total of 84,000 Enigma messages each month – two messages every minute. **Turing personally broke the form of Enigma that was used by the U-boats preying on the North Atlantic merchant convoys**. It was a crucial contribution.

## Who really cracked the Enigma code?

Bletchley Park is to celebrate the work of three Polish mathematicians who cracked the German Enigma code in World War II. **Marian Rejewski, Henryk Zygalski and Jerzy Różycki** will be remembered in a talk on Sunday at the park’s annual Polish Day.

## Why was the Enigma code so hard to crack?

The thing that made Enigma so hard to crack with contemporary means was that **the settings changed with each keystroke**. If you were to sit down at an Enigma machine right now and press the “A” key three times, you would get a different scrambled letter every time.

## When did Germany find out Enigma was broken?

On **July 9, 1941**, British cryptologists help break the secret code used by the German army to direct ground-to-air operations on the Eastern front.

## What was Alan Turing’s IQ?

185

Turing reportedly had an IQ of **185** but he was a typical 17-year-old. Turing’s report card from Sherborne School in Dorset, England notes his weakness in English and French studies. While his mathematics ‘shows distinct promise’ it was undermined by untidy work, and his essays were deemed grandiose beyond his abilities.