Using BenoƮt's Minimize-Script scripts/min.cmd, I checked all 2743 proofs 
using fvex, and 447 of them can be minimized (by 2-10 bytes) by using 
fvexd. Therefore, Glauco's assumption that many proofs become shorter is 
true. 

On Wednesday, September 8, 2021 at 1:58:31 PM UTC+2 ookami wrote:

> Norm once told me (several years ago!) that the threshold value is 7 
> theorems: If the introduction of a convenience theorem affects this many or 
> more theorems, its value outperforms the downside of having more theorems..
>
> Wolf Lammen
> [email protected] schrieb am Montag, 6. September 2021 um 01:12:20 UTC+2:
>
>> As with things like 1cnd I think it is a matter of whether the 
>> convenience theorem would get used enough times to justify having it.
>> On 9/5/21 7:22 AM, Glauco wrote:
>>
>> A theorem like
>>
>>  |- ( ph -> ( F ` A ) e. _V )
>>
>> would clearly be "redundant".
>>
>> But it would save a LOT of a1i (and shorten many proofs, I guess)
>>
>> And the autocomplete feature of mmj2 would take advantage of it (as far 
>> as I can tell, the current version doesn't add an a1i automagically).
>>
>> Comments?
>>
>>
>>
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