3 problems

Euler-line concurrence conjecture. A center on the circumcircle is concurrent for the Euler line if and only if it lies in the orbit of $X_{99}$.

Coexistence conjecture. Introducing different $?$ symbols for rules a)--d) and adopting the exact symmetric rules for the backward transitions should allow the four rules to coexis…

Let $\mathcal E$ be a strongly regular event structure, and let its domain be hyperbolic. A regular nice labeling is a finite nice labeling satisfying the regularity condition for…