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*From*: Saswata Paul <paulsaswata1@xxxxxxxxx>*Date*: Thu, 29 Aug 2019 10:23:07 -0700 (PDT)

Hi,

The BY proof for step <2>3c is not going through.

-- I have been working on a proof using TLAPS, but I seem to be stuck at a simple step which should be very obvious.

So the following is a snippet from my proof :

` <2>3a. \A Q \in Quorum: \E a \in Q : maxVBal[a] \geq b OMITTED <2>3b. b \geq 0 OMITTED <2>3c. \A Q \in Quorum: \E a \in Q : maxVBal[a] \geq 0 BY <2>3a, <2>3b`

Shouldn't <2>3c be a simple logical consequence of <2>3a and <2>3b ? (Unless I am making an extremely silly error)

Is there a syntax/semantic error that is preventing the proof from going through or is it some limitation of the back end solvers that requires this simple proof to be broken even further?

Thank you

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**Follow-Ups**:**Re: [tlaplus] Stuck on an obvious proof [TLAPS]***From:*Saksham Chand

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