User blog comment:PsiCubed2/How to make Deedlit's Mahlo-level notation more intuitive/@comment-35470197-20180807000338/@comment-30754445-20180807021104

I'm only taking Deedlit's word for it and cannot verify it myself, but according to his formula (3rd line from the end of his post):

χ(M,0) = χ(M1×1,0) = I(1@(1+1),0) = I(1@2,0) = I(1,0,0)

It could be wrong, though. Maybe Deedlit made a mistake.

Why do you think that χ(M,0) is bigger than the first (1,0)-inaccessible cardinal? Perhaps if we work through it together, we'll solve this mystery.