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  "body": "\n## Summary\n\nLet $A$ be a set and let $a_{0}$ be an element of $A$. If $\\rho$ is a function which assigns to each function $f$ mapping a nonempty section of the positive integers into $A$, an element of $A$, then there exists a unique function $h : \\mathbb{Z}_+ \\to A$ such that\n\n$$\\begin{aligned} h(1) \u0026= a_0 \\\\ h(i) \u0026= \\rho \\left(h|_{\\{1,2,\\ldots,i-1\\}}\\right) \\text{ for } i\u003e1. \\end{aligned}$$\n",
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