Element pl-order-blocks: DAG grading for proofs

This question illustrates the grading-method="dag" mode of pl-order-blocks, which is especially useful for constructing mathematical proofs.

Prove that $A \land B \land C \rightarrow A \land C$

This example uses the attribute grading-method="dag" to accept any valid topological ordering. The depends attribute on each block specifies which other blocks must appear before it.

Drag from here:
  • Assume $A \land B \land C$.
  • Since $A$ and $C$, we know $A \land C$
  • Then $A$ is true.
  • Then $C$ is true.
Construct your solution here:

Correct answer

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Title:
Element pl-order-blocks: DAG grading for proofs

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Started at:
2026-08-04 22:48:51 (CDT)
Duration:
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{
  "conjunction-implies-conjunction": [
    {
      "tag": "1",
      "uuid": "c909c973-fa3a-4b2f-86fe-262309f9ac30",
      "final": false,
      "index": 0,
      "indent": null,
      "depends": [],
      "ranking": -1,
      "group_info": {
        "tag": null,
        "depends": null
      },
      "inner_html": " Assume $A \\land B \\land C$.",
      "distractor_for": null,
      "initially_placed": false,
      "ordering_feedback": null,
      "distractor_feedback": null
    },
    {
      "tag": "2",
      "uuid": "ae94af19-088e-4868-bd5c-dd38b81ec9cb",
      "final": false,
      "index": 1,
      "indent": null,
      "depends": [
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      "ranking": -1,
      "group_info": {
        "tag": null,
        "depends": null
      },
      "inner_html": " Then $A$ is true. ",
      "distractor_for": null,
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    },
    {
      "tag": "3",
      "uuid": "f9215ec8-80be-4798-9c62-27ef602ff326",
      "final": false,
      "index": 2,
      "indent": null,
      "depends": [
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      ],
      "ranking": -1,
      "group_info": {
        "tag": null,
        "depends": null
      },
      "inner_html": " Then $C$ is true. ",
      "distractor_for": null,
      "initially_placed": false,
      "ordering_feedback": null,
      "distractor_feedback": null
    },
    {
      "tag": "4",
      "uuid": "c8719aed-7636-44b1-b116-1dff53596aae",
      "final": false,
      "index": 3,
      "indent": null,
      "depends": [
        "2",
        "3"
      ],
      "ranking": -1,
      "group_info": {
        "tag": null,
        "depends": null
      },
      "inner_html": " Since $A$ and $C$, we know $A \\land C$",
      "distractor_for": null,
      "initially_placed": false,
      "ordering_feedback": null,
      "distractor_feedback": null
    }
  ]
}
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