URGENT Question about A-> notB :))

orangetree_23

Hi!
I was wondering,

How come we can use the same notation A -> notB to represent both cases of:
1. "A and B cannot be both selected" for in/out games AND
2. "A and B cannot be added to the same group" for grouping games,

when in the first scenario, it means at least one of them, A/B has to be in the OUT group,
but for the second scenario, it means that it's either A in Group 1 and B in Group 2, or vice versa,
instead of A/B in Group 1 (or 2).

Basically, I would like to know why we can use the same notation for two scenarios that end up in different assignments.

Thanks in advance for your help!!

maco4538

yes

Matt Sorr

For in-and-out games, you're being told they can't both be in the in-group. That means at least one must be in the out-group. So both are allowed to be together in the out-group, or just one in the out-group, but they can't be together in the in-group. For typical grouping games, the type of rule you're referring to just flat-out tells you the game pieces aren't allowed to be together in any group. No ifs, ands, or buts. So for the in-and-out game, the groups are characteristically different because one of the groups is for selected items and the other is for non-selected items. That's why the rule, visually speaking, applies differently to the groups. For a typical grouping game, however, all groups are "in-groups," in that every game piece is in play. So the rule applies to each group the same.

Does this make sense?