A ⊃ B , B ⊃ C ⊢ A ⊃ C {\displaystyle A\supset B,B\supset C\vdash A\supset C}
A ⊃ B , B ⊃ C , A ⊢ C {\displaystyle A\supset B,B\supset C,A\vdash C}
// դեդուկցիայի թեորեմ
1. A ⊃ B , B ⊃ C , A ⊢ A {\displaystyle 1.\,\,A\supset B,B\supset C,A\vdash A}
// նախադրյալ
2. A ⊃ B , B ⊃ C , A ⊢ A ⊃ B {\displaystyle 2.\,\,A\supset B,B\supset C,A\vdash A\supset B}
3. A ⊃ B , B ⊃ C , A ⊢ B {\displaystyle 3.\,\,A\supset B,B\supset C,A\vdash B}
// m.p. (1,2)
4. A ⊃ B , B ⊃ C , A ⊢ B ⊃ C {\displaystyle 4.\,\,A\supset B,B\supset C,A\vdash B\supset C}
5. A ⊃ B , B ⊃ C , A ⊢ C {\displaystyle 5.\,\,A\supset B,B\supset C,A\vdash C}
// m.p. (3,4)
6. A ⊃ B , B ⊃ C ⊢ A ⊃ C {\displaystyle 6.\,\,A\supset B,B\supset C\vdash A\supset C}