See my note here:

https://github.com/metamath/set.mm/pull/1292#issuecomment-561838231

Norm

On Saturday, December 7, 2019 at 8:52:14 AM UTC-5, fl wrote:
>
> I do not want to be ironic, of course, but I have the impression that we 
> first replaced the 
> venerable"( ph -> A. x ph)" by" F/ x ph" supposed to be more meaningful 
> and that now 
> to put in common factor some parts of the proofs we reintroduce"( ph -> A. 
> x ph)" 
> beside" F/ x ph" finally returning to the previous state and multiplying 
> the proofs by two.
>
> And we hope to fight against ecological disaster.
>
> This civilization will die crushed under its own weight.
>
> (By the way "Google Translate" may I recall Thee that the translation of 
> the 
> French word "démonstration" is "proof" not "demonstration". Please !)
>
> -- 
> FL
>

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