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  "body": "\n## Summary\n\nA source, in a directed graph, is a vertex with no incoming edges (in-degree equals 0).\n",
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        "mention": "wikipedia://en/325802#39NU",
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  "url": "https://math2.tamnd.com/wiki/source/",
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        "what": "edge defines in",
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        "what": "edge instance_of in",
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        "what": "edge not_instance_of in",
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        "what": "edge specializes both",
        "note": "the more general notions and the special cases",
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