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Mirrors > Home > NFE Home > Th. List > 19.8wOLD | Unicode version |
Description: Obsolete version of 19.8w 1660 as of 4-Dec-2017. (Contributed by NM, 1-Aug-2017.) (New usage is discouraged.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
19.8wOLD.1 |
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Ref | Expression |
---|---|
19.8wOLD |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.8wOLD.1 |
. . . . 5
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2 | notnot 282 |
. . . . 5
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3 | 2 | albii 1566 |
. . . . 5
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4 | 1, 2, 3 | 3imtr3i 256 |
. . . 4
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5 | 4 | spnfw 1670 |
. . 3
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6 | 5 | con2i 112 |
. 2
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7 | df-ex 1542 |
. 2
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8 | 6, 7 | sylibr 203 |
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: (None) |
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