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Mirrors > Home > ILE Home > Th. List > orandc | Unicode version |
Description: Disjunction in terms of conjunction (De Morgan's law), for decidable propositions. Compare Theorem *4.57 of [WhiteheadRussell] p. 120. (Contributed by Jim Kingdon, 13-Dec-2021.) |
Ref | Expression |
---|---|
orandc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm4.56 770 |
. 2
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2 | dcn 828 |
. . . . 5
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3 | 2 | adantr 274 |
. . . 4
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4 | dcn 828 |
. . . . 5
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5 | 4 | adantl 275 |
. . . 4
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6 | dcan 919 |
. . . 4
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7 | 3, 5, 6 | sylc 62 |
. . 3
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8 | dcor 920 |
. . . 4
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9 | 8 | imp 123 |
. . 3
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10 | con2bidc 861 |
. . 3
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11 | 7, 9, 10 | sylc 62 |
. 2
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12 | 1, 11 | mpbii 147 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 |
This theorem depends on definitions: df-bi 116 df-stab 817 df-dc 821 |
This theorem is referenced by: gcdaddm 11708 |
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