Let $L$ be a non-split prime alternating link with $n>0$ crossings. We show that for each fixed $g$, the number of genus-$g$ Seifert surfaces is bounded by an explicitly given polynomial in $n$. The result also holds all spanning Euler characteristic. Previously known bounds were exponential.

Recent observations have revealed a population of $\alpha$-element abundances enhanced giant stars with unexpected high masses ($\gtrsim$1 $M_\odot$) from asteroseismic analysis and spectroscopy. Assuming single-star evolution, their imply young ages ($\tau<6$Gyr) incompatible the canonical Galactic chemical evolution scenario. Here we study chemistry kinematics large sample such $\alpha$-rich,...

Abstract The lifetime of protoplanetary disks is a crucial parameter for planet formation research. Observations disk fractions in star clusters imply median lifetimes 1–3 Myr. This very short calls to occur extremely rapidly. We show that young, distant (≤5 Myr, &gt;200 pc) often dominate these types studies. Such frequently suffer from limiting magnitudes leading an over-representation high-m...

Central nervous system (CNS) abnormalities in children related to COVID-19 occur acute and delayed manifestations, a recent study has found. Previously, such manifestations were described mainly case reports. But order understand the full spectrum of disease adolescents, it's important have enough cases aggregate look at neuroimaging manifestations.