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APKPure uses signature verification to ensure virus-free Natural Deduction for Android APK downloads for you.
Proof Generator and Proof Checker
Let Proof Generator generate proofs for you.
Practice your own natural deduction skills with Proof Checker. Save your exercises on device and return to them later on.
Includes truth-functional classical logic and (optionally) modal logic S5.
One-click to install XAPK/APK files on Android!