[mizar] Help request: Fraenkel term definition

[Greg Frascadore <gfrascadore@qwest.net>]

 Hello. I am having trouble finding Mizar's definition of the 
 Fraenkel term, and more generally, what definitions are hidden. 

 After reading the scheme axiom at TARSKI:sch 1 and looking around the 
 rest of the MML, I don't understand how the constructor-like notation: 
        { x : P[x] } 
 is defined. It's as if there is an invisible Mizar declaration resembling: 

        func { x : P[x] } means y in it iff ex x st y = x & P[x]; 

 Yet, I don't see it in hidden.miz.  How does one know what definitions 
 are available but hidden? 

 Thanks 
 - Greg Frascadore 


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