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Mirrors > Home > ILE Home > Th. List > ax-ia3 | GIF version |
Description: 'And' introduction. One of the axioms of propositional logic. (Contributed by Mario Carneiro, 31-Jan-2015.) |
Ref | Expression |
---|---|
ax-ia3 | ⊢ (𝜑 → (𝜓 → (𝜑 ∧ 𝜓))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . 2 wff 𝜑 | |
2 | wps | . . 3 wff 𝜓 | |
3 | 1, 2 | wa 97 | . . 3 wff (𝜑 ∧ 𝜓) |
4 | 2, 3 | wi 4 | . 2 wff (𝜓 → (𝜑 ∧ 𝜓)) |
5 | 1, 4 | wi 4 | 1 wff (𝜑 → (𝜓 → (𝜑 ∧ 𝜓))) |
Colors of variables: wff set class |
This axiom is referenced by: ex 108 pm3.2 126 pm5.54dc 827 pclem6 1265 xoranor 1268 ax10oe 1678 2pwuninelg 5898 dmaddpq 6477 dmmulpq 6478 ltsopr 6694 ax1hfs 9898 |
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