About "implies" between WF and SF

[Huailin]

Hillel,

I am reading again your article this evening at https://www.hillelwayne.com/post/fairness/

I feel that the “Weak” fairness implies the existence of “strong” fairness. may introduce bit confusion to beginners. 

I mean, the "imply" word could make people get confused. I don't think you want to say:

WF implies SF, which means:  WF(A) --> SF(A).  However, from TLA+, It should be otherwise. I mean, SF(A)-->WF(A).

I guess you just wanted to tell readers that the "existence of SF". So, maybe we don't want to use "implies" word here, which is more a reserved word for prepositional logic.

Best regards，

Michael

[hwa...@gmail.com]

Hi Michael,

Gonna push a fix tonight. Feel free to email me directly about issues like this, I'll see them faster than stuff posted to the newsgroup :)

H

[Huailin]

Awesome. 

Yeah. The reason why I sent to our group is: I am not confident enough about my understanding about WF and SF and feel that maybe more EYES can discuss it. 

Sometimes, WF and SF relation indeed a bit confusing. I feel it is from the word of "weak" and "strong"

Below is my explanation:

Weak Fairness: Need STRONG condition --ALWAYS ENABLED

Strong Fairness:  Need Weak condition. --ONLY infinitely many ENABLED.

Hence, if  SF(A) is TRUE, then, surely, WF(A) shall be TRUE. 

Then,   SF(A)--->WF(A) is TRUE.  

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