This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.
Metamath Proof Explorer
Description: Minus and plus infinity are different. (Contributed by David A. Wheeler, 8-Dec-2018)
|
|
Ref |
Expression |
|
Assertion |
mnfnepnf |
|- -oo =/= +oo |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
pnfnemnf |
|- +oo =/= -oo |
| 2 |
1
|
necomi |
|- -oo =/= +oo |