  Recently Li et al (2019 Nature 572 624) discovered a new type of oxide
superconductor Nd0.8Sr0.2NiO2 with T$_c$ = 14 K. To classify superconductivity
in this infinite-layer nickelate experimental upper critical field,
B$_{c2}$(T), and the self-field critical current densities, J$_c$(sf,T),
reported by Li et al (2019 Nature 572 624), are analysed in assumption of s-,
d-, and p-wave pairing symmetries and single- and multiple-band
superconductivity. Based on deduced the ground-state superconducting energy
gap, $\Delta$(0), the London penetration depth, $\lambda$(0), the relative jump
in electronic specific heat at Tc, $\Delta$C/C, and the ratio of
2$\Delta$(0)/k$_B$T$_c$, we conclude that Nd0.8Sr0.2NiO2 is type-II
high-$\kappa$ weak-coupled single-band s-wave superconductor.
