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As DamianoJack Lee mentions, $|E|-|V|+1$the related quantity(your number plus 1)$|V|-|E|$ is often called the Euler characteristic of the graph. I have also heard $|E|-|V|+1$ called the cyclomatic number.
As Damiano mentions, $|E|-|V|+1$(your number plus 1) is often called the Euler characteristic of the graph. I have also heard $|E|-|V|+1$ called the cyclomatic number.
As Jack Lee mentions, the related quantity$|V|-|E|$ is often called the Euler characteristic of the graph. I have also heard $|E|-|V|+1$ called the cyclomatic number.
As Damiano mentions, $|E|-|V|+1$ (your number plus 1) is often called the Euler characteristic of the graph. I have also heard $|E|-|V|+1$ called the cyclomatic number.
