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*From*: Stephan Merz <stephan.merz@xxxxxxxxx>*Date*: Sat, 3 Oct 2020 08:24:31 +0200*References*: <3db0a094-02e8-484b-9aae-eb2930f4e269n@googlegroups.com> <f51dc912-3169-48d3-a108-7b86fcc2f3b1n@googlegroups.com>

To follow up on this, Q is not really "defined" by this formula because a definition would have to be unambiguous. The formula checks for the existence of a quorum satisfying certain properties. The quantifier introduces (or "declares") a name Q for naming the value whose properties are being described in lines 2-10 and requires Q to belong to the set Quorum. The formula is true if some such value exists and false otherwise. Also, the scope of Q is restricted to the body of the formula, and Q has no meaning after the formula has been evaluated, in contrast to a definition that introduces a name that can be used later. Stephan
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**Follow-Ups**:**Re: [tlaplus] Re: [Newbie Question] Engineer trying to get maths meaning***From:*Frank Eaves

**Re: [tlaplus] [Newbie Question] Engineer trying to get maths meaning***From:*Igor Konnov

**References**:**[tlaplus] [Newbie Question] Engineer trying to get maths meaning***From:*Frank Eaves

**[tlaplus] Re: [Newbie Question] Engineer trying to get maths meaning***From:*Rodrick Chapman

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