How many solutions are there in Z2?

  • Thread starter loki91
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In summary, the problem is to find all solutions in Z2 to the system of equations: x1 + x3 + x4 = 1, x1 +x2 +x4 +x5 =1, and x1 + x5 = 1. After reducing the equations, the following solution was obtained: x3 = x5 - x4, x2 = - x4, and x1 = 1 - x5. In Z2, the specific value of x1 does not matter. To find all solutions, one must enumerate all possible combinations for x4 and x5 and evaluate the equations for each combination.
  • #1
loki91
3
0

Homework Statement



In Z2 find all solutions to

x1 + x3 + x4 = 1
x1 +x2 +x4 +x5 =1
x1 + x5 = 1.

How many solutions in total are there?

The Attempt at a Solution



I attempted to reduce row it however I'd be left with a "1" on the right hand side. Its not hard but I am hitting some sort of block!
 
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  • #2
The presence of a 1 on the RHS isn't a problem. You're trying to solve an inhomogeneous system, so a constant term in the solution is expected.

What equations did you get after you reduced them?
 
  • #3
Since this is a nonhomogeneous system (as vela points out), you should be working with an augmented matrix with 3 rows and 6 columns. The sixth column will have the constants.
 
  • #4
vela said:
The presence of a 1 on the RHS isn't a problem. You're trying to solve an inhomogeneous system, so a constant term in the solution is expected.

What equations did you get after you reduced them?

Mark44 said:
Since this is a nonhomogeneous system (as vela points out), you should be working with an augmented matrix with 3 rows and 6 columns. The sixth column will have the constants.

Okay, after I reduced this is what I got:

1 0 0 0 1 1
0 1 0 1 0 0
0 0 1 1 -1 0

so,

x3 = x5 - x4
x2 = - x4
x1 = - 1 - x5

??
 
  • #5
It should be x1 = 1 - x5, but in Z2, it doesn't really matter.

Now just enumerate all possible combinations for x4 and x5 and evaluate the equations for each combination to find all the solutions to the system.
 

What does "In Z2 find all the solutions" mean?

In Z2 refers to the set of integers modulo 2, which includes only the numbers 0 and 1. Finding all the solutions means determining all the possible values for the given equation or problem within this set.

What types of problems can be solved using "In Z2 find all the solutions"?

Problems that involve equations with integer coefficients and a finite number of solutions can be solved using In Z2. This includes problems in algebra, number theory, and cryptography.

How does the solution set in Z2 differ from the solution set in the set of integers?

The solution set in Z2 is limited to only the values 0 and 1, while the solution set in the set of integers includes all positive and negative integers. Additionally, in Z2 the operations of addition and multiplication are performed modulo 2, meaning that any result greater than 1 is reduced to either 0 or 1.

What is the significance of solving problems in Z2?

Solving problems in Z2 can have real-world applications in fields such as computer science, coding theory, and engineering. It can also help to develop critical thinking and problem-solving skills.

What is the process for finding all the solutions in Z2?

The process involves setting up and solving equations using the rules of arithmetic in Z2, including performing operations modulo 2. The solutions are then found by determining all possible values for the variables within the given equation or problem.

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