In this Wikipedia entry on Cassini's identity, I saw this equation:
$F_{n-1}F_{n+1}-F^2_n=(-1)^n$
$F^2_n$, what does that mean? Is it a summation signs for n to 2? I don't know what it means.
In this Wikipedia entry on Cassini's identity, I saw this equation:
$F_{n-1}F_{n+1}-F^2_n=(-1)^n$
$F^2_n$, what does that mean? Is it a summation signs for n to 2? I don't know what it means.
$F_n^2$ is the square of the $n^{\text{th}}$ Fibonacci number.