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いったいどうすれば，ゲーム感覚で勉強できるんでしょうね．

文科省さまがこんなキャンペーンを．金環蝕も近いことだし，大判に印刷して貼っておきたいな．太陽に関する用語集もあるんだそうです．

LFやTwelfの流れを汲む証明系。証明木が見易いのが売りのようです。 [Types ML より] If you're planning to teach a programming language or logic foundations course and are thinking about using a proof assistant, you might consider SASyLF. SASyLF (Second-order Abstract Syntax Logical Framework) is an LF-based proof assistant that the same logical foundation and many of the same advantages as Twelf (in particular, variable binding is "built in"). However, it uses a syntax very close to that used for proofs on paper, giving the tool a much gentler learning curve--and much better error messages--than many alternatives.

SASyLF を採用した CMU での型理論の講義実施例