Description: An identity theorem for substitution. See sbid . See Remark 9.1 in Megill p. 447 (p. 15 of the preprint). (Contributed by DAW, 18-Feb-2017)
Ref | Expression | ||
---|---|---|---|
Assertion | sbidd-misc | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbid | |
|
2 | 1 | imbi2i | |