Sobre "Ella es Bárbara, mi primera esposa"

[Stephen is the host at a dinner party; he is standing next to a woman, Barbara,
whom he is introducing to a guest.]
“This is Barbara, my first wife.”

What is stated: Stephen at some point married Barbara, and never married anyone else before marrying Barbara.

What is implicated: Stephen is either no longer married to Barbara, or, if he is still married to her, he expects to marry someone else subsequently.

Maxims: Stephen is exploiting two maxims:
(1b) The second maxim of quantity (“don’t be over informative”). The information conveyed is that he was not married to anyone before he was married to Barbara. Surely that information is not needed.
(3) Relevance: That Stephen has never been married before is irrelevant to the identification of this woman; what is relevant is that she is his current (or former) wife, and that her name is ‘Barbara’.
The audience is supposed to reason: Stephen mentions that Barbara is his first wife, which seems irrelevant and over-informative. But he mentions it, so it must be relevant. How? Since Barbara is at the party, she must be his current wife (how many men invite their ex-wives to their parties?). Since
he says she’s his first wife, he obviously hasn’t been married before. So there is no ‘second wife’ at present—Barbara is the only woman he has ever (so far, at least) been married to. Stephen must expect, then, that there will be a time when it is important to distinguish between his first wife and
other wives. But this is his first wife. So any other wives there might be will be future wives. Therefore, Stephen expects to be married again. So he expects either to outlive or be divorced from Barbara. This, then, is what he is implicating.

tomado de https://faculty.washington.edu/smcohen/453/GriceLogicDisplay.pdf