What is the differnece in meaning between the notstions of a line over QR and not a line over QR?
The difference in meaning between the notions of a line over "QR" and not a line over "QR" is related to the notation used in mathematics.
When a line is placed over a set of symbols or variables, it typically denotes a Bar notation, which is used to represent an average or a mean value.
If you see a line over "QR" (πΜ
π
Μ
), it would indicate the average of the variables π and π
.
On the other hand, if there is no line over "QR" (QR), it implies that you are referring to the set of variables as they are, without any special notation.
To calculate the average or mean of a set of variables, you would normally add up all the variables and divide the sum by the number of variables.