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Mirrors > Home > MPE Home > Th. List > pnfxr | Structured version Visualization version Unicode version |
Description: Plus infinity belongs to the set of extended reals. (Contributed by NM, 13-Oct-2005.) (Proof shortened by Anthony Hart, 29-Aug-2011.) |
Ref | Expression |
---|---|
pnfxr |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun2 3777 |
. . 3
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2 | df-pnf 10076 |
. . . . 5
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3 | cnex 10017 |
. . . . . . 7
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4 | 3 | uniex 6953 |
. . . . . 6
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5 | 4 | pwex 4848 |
. . . . 5
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6 | 2, 5 | eqeltri 2697 |
. . . 4
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7 | 6 | prid1 4297 |
. . 3
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8 | 1, 7 | sselii 3600 |
. 2
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9 | df-xr 10078 |
. 2
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10 | 8, 9 | eleqtrri 2700 |
1
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