The dimension of $\operatorname{SL}(n,F)$ as a linear algebraic group

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For an algebraically closed field $F$, what is the dimension of $\operatorname{SL}(n,F)$ as an algebraic group? Can anyone refer me to a place in the literature where this is calculated?

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The dimension is $n^2-1$. It's a hypersurface in $F^{n^2}$ defined by the equation determinant${}=1$. Any text on linear algebraic groups, for instance that by Humphreys, will have this.