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Mirrors > Home > MPE Home > Th. List > id | Structured version Visualization version Unicode version |
Description: Principle of identity.
Theorem *2.08 of [WhiteheadRussell]
p. 101. For
another version of the proof directly from axioms, see idALT 23.
Its
associated inference, idi 2, requires no axioms for its proof, contrary
to id 22. Note that the second occurrences of ![]() ![]() |
Ref | Expression |
---|---|
id |
![]() ![]() ![]() ![]() ![]() ![]() |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-1 6 |
. 2
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
2 | ax-1 6 |
. 2
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
3 | 1, 2 | mpd 15 |
1
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