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Metamath Proof Explorer
Description: Plus infinity is not a real number. (Contributed by Glauco Siliprandi, 23-Oct-2021)
|
|
Ref |
Expression |
|
Assertion |
pnfnre2 |
|- -. +oo e. RR |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
pnfnre |
|- +oo e/ RR |
| 2 |
1
|
neli |
|- -. +oo e. RR |