X5210 : %THEOREM%

X5210 is a theorem.
Exercise:
[= 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.

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