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Mirrors > Home > NFE Home > Th. List > axie2 | Unicode version |
Description: A key property of existential quantification (intuitionistic logic axiom ax-ie2). (Contributed by Jim Kingdon, 31-Dec-2017.) |
Ref | Expression |
---|---|
axie2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-nf 1545 |
. 2
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2 | 19.23t 1800 |
. 2
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3 | 1, 2 | sylbir 204 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-11 1746 |
This theorem depends on definitions: df-bi 177 df-ex 1542 df-nf 1545 |
This theorem is referenced by: (None) |
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