\node (gamma) at (0, 2) {$\Gamma$};
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\node (prod) at (0, 0) {$\beta^\alpha \times \alpha$};
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\node (arg) at (2.5, 0) {$\alpha$};
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\node (func) at (-2.5, 0) {$\beta^\alpha$};
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\draw[->] (gamma) -- node[midway] {$\left<f,x\right>$} (prod);
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\draw[->] (prod) -- node[midway] {$\pi_1$} (func);
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\draw[->] (prod) -- node[midway,below] {$\pi_2$} (arg);
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\draw[->] (gamma) -- node[midway] {$f$} (func);
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\draw[->] (gamma) -- node[midway] {$x$} (arg);
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