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Mirrors > Home > NFE Home > Th. List > 19.8w | Unicode version |
Description: Weak version of 19.8a 1756. Uses only Tarski's FOL axiom schemes. (Contributed by NM, 1-Aug-2017.) (Proof shortened by Wolf Lammen, 4-Dec-2017.) |
Ref | Expression |
---|---|
19.8w.1 |
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Ref | Expression |
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19.8w |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.8w.1 |
. 2
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2 | 19.2 1659 |
. 2
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3 | 1, 2 | syl 15 |
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-9 1654 |
This theorem depends on definitions: df-bi 177 df-an 360 df-ex 1542 |
This theorem is referenced by: 19.9v 1664 |
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