X5210 : %THEOREM%X5210 is a theorem.
[= x(A)] = LAMBDA z(A) EXISTS y(A) .y = x AND z = y
All rules and commands, including ADVICE, are allowed.
Only book theorems may be ASSERTed as lemmas without proof.
For a complete list of book theorems, type PROBLEMS.
No more help available. Sorry.
TPS documentation homepage