Description: The value of the embedding from the extended real numbers into a complete lattice. (Contributed by Thierry Arnoux, 19-Feb-2018)
Ref | Expression | ||
---|---|---|---|
Hypotheses | xrhval.b | |
|
xrhval.l | |
||
xrhval.u | |
||
Assertion | xrhval | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xrhval.b | |
|
2 | xrhval.l | |
|
3 | xrhval.u | |
|
4 | elex | |
|
5 | fveq2 | |
|
6 | 5 | fveq1d | |
7 | fveq2 | |
|
8 | 7 3 | eqtr4di | |
9 | 5 | imaeq1d | |
10 | 9 1 | eqtr4di | |
11 | 8 10 | fveq12d | |
12 | fveq2 | |
|
13 | 12 2 | eqtr4di | |
14 | 13 10 | fveq12d | |
15 | 11 14 | ifeq12d | |
16 | 6 15 | ifeq12d | |
17 | 16 | mpteq2dv | |
18 | df-xrh | |
|
19 | xrex | |
|
20 | 19 | mptex | |
21 | 17 18 20 | fvmpt | |
22 | 4 21 | syl | |