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What do you want to prove today?

Session 1

  • A
  • A
  • A
  • B
  • A
  • A
  • B
  • B
  • A
  • A
  • B
  • A∧B
  • A
  • A∧B
  • A
  • A∧B
  • A
  • B
  • A∧B
  • A∧B
  • B∧A
  • (A∧B)∧C
  • A
  • B
  • C
  • (A∧B)∧C
  • A∧C
  • (A∧B)∧C
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  • A∧(B∧C)

Session 2

  • A
  • Vest Heusen winter Vest Heusen Boutique winter Van Boutique Boutique Van A→B
  • B
  • A
  • A→B
  • B→C
  • C
  • A
  • A→B
  • A→C
  • B→D
  • C→D
  • D
  • A
  • A→A
  • A
  • A→B
  • B→C
  • A→C
  • A→B
  • A→(B→C)
  • A→C
    Van Van Boutique Vest Vest Heusen Heusen Boutique winter winter Boutique
  • A→A
  • A→C
  • B→C
  • A∧B
  • C
  • A→C
  • B→C
  • A∧B→C
  • B
  • A→B
  • A∧B→C
  • A→(B→C)
  • A→(B→C)
  • A∧B→C
  • (A→B)∧(A→C)
  • A→B∧C
  • A→(A→B)
  • (A→B)→A

Session 3

  • A
  • B
  • A∨B
  • A
  • A∨B
  • B
  • A∨B
  • A
  • A∨A
  • A∨B
  • B∨A
  • A∨(B∨C)
  • (A∨B)∨C
  • A∧B
  • A∨B
  • (A∧B)∨C
  • (A∨C)∧(B∨C)
  • (A∨B)∧C
  • (A∧C)∨(B∧C)
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  • (A→C)∧(B→C)
  • A∨B→C
  • A∨B→C
  • (A→C)∧(B→C)
  • (A→B)∨(A→C)
  • A→B∨C

Session 4

  • ⊥
  • A
  • ⊥
  • A
  • B
  • A
  • ⊥∨A
  • ⊥∨A
  • A
  • ⊥∧A
  • ⊥
    • ⊥→A
    • A→B
    • (B→⊥)→(A→⊥)
    • A∨B→⊥
    • (A→⊥)∧(B→⊥)
    • (A→⊥)∧(B→⊥)
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    • A∨B→⊥
    • (A→⊥)∨(B→⊥)
    • A∧B→⊥
    • ((A→⊥)→⊥)→⊥
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    • A→⊥
    • (A→⊥)∨B
    • A→B
    • A→⊥
    • B→A
    • B→⊥
    • ((A→⊥)∨(B→⊥))∨(C→⊥)
    • (A∧B)∧C→⊥
      • (A∨(A→⊥)→⊥)→⊥

      Session 5

        Boutique Boutique Heusen Boutique Van Heusen winter Van Vest Vest winter
      • A∨(A→⊥)
      • (B→⊥)→(A→⊥)
      • A→B
      • A∧B→⊥
      • (A→⊥)∨(B→⊥)
      • (A→⊥)→⊥
      • A
      • A→B
      • (A→⊥)∨B
      • A→B
      • B→C
      • (A→⊥)∨C
        • ((A→B)→A)→A
        • (A∧B)∧C→⊥
        • ((A→⊥)∨(B→⊥))∨(C→⊥)
        • (A→B)→⊥
        • A∧(B→⊥)

        Session 6

        • ∀x.P(x)
        • P(a)
        • ∀x.P(x)
        • P(a)∧P(b)
        • P(a)
        • ∃x.P(x)
        • ∀x.P(x)
        • ∃x.P(x)
        • ∀x.A
        • A
        • ∃x.A
        • A
        • A∧(∀x.P(x))
        • ∀x.A∧P(x)
        • winter Heusen Vest Vest Heusen Boutique Boutique Boutique winter Van Van (∀x.P(x))∧(∀x.Q(x))
        • ∀x.P(x)∧Q(x)
        • (∃x.P(x))∨(∃x.Q(x))
        • ∃x.P(x)∨Q(x)
        • (∃x.P(x))→A
        • ∀x.P(x)→A
        • ∀x.P(x)→Q(x)
        • P(a)
        • Q(a)
        • ∀x.∀y.P(x,y)
        • Heusen winter winter Vest Heusen Boutique Vest Van Boutique Boutique Van ∀y.∀x.P(x,y)
        • ∃x.∃y.P(x,y)
        • ∃y.∃x.P(x,y)
        • ∃x.∀y.P(x,y)
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        • ∀y.∃x.P(x,y)
        • ∀x.P(x)
        • (∃x.P(x)→⊥)→⊥
        • (∀x.P(x))→⊥
        • winter Vest Van Van Boutique Heusen Vest winter Heusen Boutique Boutique ∃x.P(x)→⊥
        • (∀x.P(x))→A
        • ∃x.P(x)→A

        Van winter Van Vest Vest Heusen Boutique Heusen winter Boutique Boutique Session 7

          • ∃x.t(x)→(∀x₁.t(x₁))
          • ∀x.(r(x)→⊥)→r(f(x))
          • ∃x.r(x)∧r(f(f(x)))

          Hilbert system

            • A→A
              • ¬A→(A→B)
                • (A→B)→((¬A→B)→B)

                NAND calculus

                • Van winter Boutique winter Vest Boutique Heusen Vest Heusen Van Boutique A↑B
                • B↑A
                • A
                • (A↑A)↑(A↑A)
                  • (A↑A)↑A
                  • (A↑A)↑(A↑A)
                  • A
                  • A
                  • B
                  • (A↑B)↑(A↑B)
                  • (A↑B)↑(A↑B)
                  • Van winter Boutique Van Boutique Boutique Heusen Vest Vest winter Heusen A
                  • B

                  Simply type lambda calculus

                    • (λx.x):a→a
                      Vest Van Heusen winter winter Vest Heusen Van Boutique Boutique Boutique
                    • (λx.λy.x):a→(b→a)
                      • (λx.λy.λz.(x⋅z)⋅(y⋅z)):(a→(b→c))→((a→b)→(a→c))

                      Welcome to The Incredible Proof Machine!

                      What is this?

                      This is a tool to perform proofs in various logics (e.g. propositional, predicate logic) visually: You simply add blocks that represent the various proofs steps, connect them properly, and if the conclusion turns green, then you have created a complete proof!

                      Why is this?

                      The Incredible Proof Machine was created to convey the fun and joy of doing proofs, especially in a computer aided way, without first having to learn the syntax of a “real” thereom prover like Regular Dress Shirt Regular Fit Dress Shirt Fit TH6xw.

                      Why is the conclusion not green?

                      Because your proof is not a proof (yet). This can have these reasons:

                      How do I enter these funny characters?

                      There are only a few places where you actually have to enter formulas, mostly if you want to use the ✎P-block or define your own tasks. There, you can use the following abbreviations:

                      Instead of ∧ ∨ → ↑ ¬ ∀ ∃ Boutique Heusen Heusen Vest Vest winter Boutique Boutique winter Van Van ⊥
                      you can write & | -> ^ ~ ! ? False

                      How do I create a custom task with multiple assumptions or conclusions?

                      winter Van Boutique Boutique Van Heusen winter Heusen Vest Boutique Vest Just put each assumption and conclusion on its own line, i.e. press enter after each of them.

                      How do I create custom blocks?

                      Heusen winter Boutique Van Boutique Van Boutique Vest Vest winter Heusen You can select blocks in a proof by clicking them while holding down Shift. Then, the option to create a custom block wrapping the ones you've selected will appear.

                      Where did my proofs go?

                      Currently, your proofs will only be saved in your own browser. This means they will be lost when you delete your local storage after you close this window/tab, or if this is a private browsing session or similar. We have plans to save your progress on our server in a future version.

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                      Who did this?

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                      Where can I read more about this?

                      For more information about the Incredible Proof Machine, especially from an academic point of view, please see the following publications:

                      Can I help?

                      Most certainly! Everything is Free Software, so you can jump right in, Blazer winter winter Blazer Leisure Worn Leisure Leisure Leisure Worn Blazer Worn winter pwIdw and start contributing. The more people contribute, the more incredible the The Incredible Proof Machine becomes.

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                      Materials 100% Polyester