I Absolute value bars in dot product derivation

member 731016 · Mar 20, 2023

Dose someone please know why they have the absolute value bars in this derivation?

many thanks!

jedishrfu · Mar 20, 2023

The absolute value bars indicate the length of the vector not absolute value of a number.

Of course, the vector length is always positive.

I think this convention was more popular in early vector math books where as now they use the double v-bar notation.

https://en.wikipedia.org/wiki/Norm_(mathematics)

member 731016 · Mar 20, 2023

jedishrfu said:

The absolute value bars indicate the length of the vector not absolute value of a number.

Of course, the vector length is always positive.

I think this convention was more popular in early vector math books where as now they use the double v-bar notation.

https://en.wikipedia.org/wiki/Norm_(mathematics)

Thank you for your help @jedishrfu !

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