Conditional Logic 202 Conditionals/Bi-Conditionals

[AndrewR84]

Question Regarding Conditionals vs. Bi-Conditionals

I'm reading the strategy guide Ch 7, Conditional Logic 202 and I'm looking at the first set of examples (pages 306-310).

Example one states: J and K cannot both be selected.

In if/then form:
J->-K
K-> -J

These are represented as single conditional rules, which makes sense based on everything I've learned up and to this point.

Example eight states: N and W cannot both be on the same team.

These are represented as bi-conditionals.

Nx<->Wy and Ny<->Wx

I'm having difficulty understanding why one would be a bi-conditional over the other.
The first rule addresses the issue with respect to in versus out. But if we thought of "ins" and "outs" being separate teams, then wouldn't this be a bi-conditional as well.

Thanks for your help.

Happy Veterans Day!

Andrew

[ohthatpatrick]

If you think of IN's and OUT's as teams, then saying
"J and K can't both be selected"
is saying
"J and K can't both be on the IN team".

But that still allows them to be together on the Out team. It doesn't prohibit them from ever being together.

Meanwhile, "J and K can't be on the same team" prohibits them from ever being together.

Hope this helps.