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Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > rmoimi | Structured version Visualization version GIF version |
Description: Restricted "at most one" is preserved through implication (note wff reversal). (Contributed by Alexander van der Vekens, 17-Jun-2017.) |
Ref | Expression |
---|---|
rmoimi.1 | ⊢ (𝜑 → 𝜓) |
Ref | Expression |
---|---|
rmoimi | ⊢ (∃*𝑥 ∈ 𝐴 𝜓 → ∃*𝑥 ∈ 𝐴 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rmoimi.1 | . . 3 ⊢ (𝜑 → 𝜓) | |
2 | 1 | a1i 11 | . 2 ⊢ (𝑥 ∈ 𝐴 → (𝜑 → 𝜓)) |
3 | 2 | rmoimia 3621 | 1 ⊢ (∃*𝑥 ∈ 𝐴 𝜓 → ∃*𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2106 ∃*wrmo 3092 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1839 ax-4 1853 ax-5 1953 |
This theorem depends on definitions: df-bi 199 df-an 387 df-ex 1824 df-mo 2550 df-ral 3094 df-rmo 3097 |
This theorem is referenced by: 2rexreu 42128 |
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