*appeal to ignorance*has two forms:

- The fact that
*p*is not known to be false is taken as a reason to believe that*p*is true.

- We don't know that it is not the case that Pegasus exists.
- Therefore, Pegasus exists.

- We don't know that not-
*p*. - Therefore,
*p*.

- The fact that
*p*is not known to be true is taken as a reason to believe that*p*is false.

- We don't know that it is the case that Pegasus exists.
- Therefore, Pegasus does not exist.

- We don't know that
*p*. - Therefore, not-
*p*.

- We don't know that it is the case that Pegasus exists.
- Therefore,
*to all intents and purposes*, Pegasus does not exist.

- We don't know that it is not the case that Pegasus exists.
- Therefore,
*to all intents and purposes*, Pegasus exists.

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