You can have a credence of 1⁄2 for heads in the absence of which-day knowledge, but for consistency you will also need P(Heads | Monday) = 2⁄3 and P(Monday) = 3⁄4. Neither of these match frequentist notions unless you count each awakening after a Tails result as half a result (in which case they both match frequentist notions).
You can have a credence of 1⁄2 for heads in the absence of which-day knowledge, but for consistency you will also need P(Heads | Monday) = 2⁄3 and P(Monday) = 3⁄4. Neither of these match frequentist notions unless you count each awakening after a Tails result as half a result (in which case they both match frequentist notions).