 In contrast to the reformatory nature of the above approach, the second one is conservative. On this approach, the Ratio Formula is sufficient by itself as a norm (or definition) for conditional credences. It makes sense to have a credence conditional on “the coin is fair” because one’s credence in that conditioning proposition ought to be an infinitesimal rather than zero. This approach may be called the approach of infinitesimals. It forms a natural package with the infinitesimal approach to saving Regularity from the Coin Case, which was discussed in  section 3.3.