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  "body": "\n## Summary\n\nThe exponential function $x \\mapsto e^x$ is the function that equals its own derivative and takes the value $1$ at $0$. It turns sums into products, and it is the sum of the power series $\\sum x^n / n!$. The node [[exponential function|0RMVS7RXZX]] gives the precise definition.\n",
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