Maths Dictionary · SS 2
Common difference
Simple meaning
The fixed amount added each time in an arithmetic progression.
Example
In 4, 10, 16, 22, … the common difference d = 6.
See it
From the Arithmetic Progression lesson. Try moving things around.
Tₙ = 3 + (n − 1)×4 = 4n − 1
First term a3
Difference d4