What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Karen is curious if and only if William is climbing a mountain. William is climbing a mountain or Jennifer is not playing squash. Karen is curious or Jennifer is playing squash.
If Jennifer plays squash, then William is climbing a mountain can be inferred via the rewriting rule. If Karen were curious, then William is climbing a mountain can be inferred via the biconditional elimination rule. If William climbs a mountain, then Karen is curious can be inferred via the biconditional elimination rule.