{
  "aliases": [
    "retraction"
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  "body": "\n## Summary\n\nA left inverse of a function undoes the function: applied after the function, it gives back the input.\n",
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    "name": "Left inverse",
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        "locator": "Left inverses",
        "url": "https://en.wikipedia.org/wiki/Inverse_function"
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  "msc": [
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  "name": "Left inverse",
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  "url": "https://math2.tamnd.com/wiki/left-inverse/",
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    "tag": "05SG20AMXH",
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