Draw a truth table for x XOR 1 = x

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Discussion Overview

The discussion revolves around verifying the boolean identity x XOR 1 = x using boolean algebra and drawing a truth table. The scope includes homework-related inquiries and technical explanations of boolean operations.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant states that they have proven the equation is false using boolean algebra but seeks assistance in drawing a truth table to support their findings.
  • Another participant asks what values x can take, implying a need for clarification on the variable's possible states.
  • A subsequent reply confirms that x can be true or false (1 or 0) but expresses uncertainty about how to proceed with the truth table.
  • Another participant inquires about the typical approach to drawing a truth table, suggesting a need for guidance on the process.
  • A later post notes that not all binary operations require two variables for input, providing an example with the NOT operation.
  • It is mentioned that the XOR operation does not necessarily require two variables, indicating a broader understanding of the operation's requirements.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the truth table and the application of the XOR operation. There is no consensus on how to proceed with drawing the truth table or on the validity of the initial claim.

Contextual Notes

There are limitations in the discussion regarding the assumptions about the XOR operation and the handling of the constant value '1' in the context of the truth table.

larry21
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Homework Statement


Using boolean algebra, verify if the identity is true. Draw truth table to verify answers.

x XOR 1 = x

The Attempt at a Solution


x \oplus 1 = x

(x’ * 1) + (x * 1’)
(x’ * 1) + (x * 0)
(x’ * 1) + 0
(x’ * 1)
x’

I've proven that the equation is false. How do I draw truth table to prove it? Help appreciated. Thanks.
 
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You are using the truth table to verify the answer - what values can x take?
 
x can be true or false (1 or 0). I still don't know how to proceed...
 
How would you normally go about drawing a truth-table?
 
Normally I look at the equation; usually there are 2 variables and I list all possible combinations for them. but in this case, there's only one variable and a 1. What do I do with the 1?
 
Not all binary operations require two numbers for input.
The NOT operation for eg.

The XOR operation does not require two variables - just two numbers.
 

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