Notations

1-µδt

Probability of number of COVID-19 cases during the interval δt plus higher order terms in δt.

P_n

Steady state probability of exactly n cumulative COVID-19 cases in a country.

P_n(t)

Transient state probability of exactly n cumulative COVID-19 cases in a country.

P_n-1(t)

Transient state probability of n - 1 cumulative COVID-19 cases in a country.

P_n+1(t)

Transient state probability of n + 1 cumulative COVID-19 cases in a country.

P_n(t + δt)

Probability of having n cumulative cases in a country at time t + δt.

L_q

Expected number of cumulative COVID-19 cases in a country minus cumulative close cases.

L_s

Expected no of cumulative COVID-19 cases in a country.

W_q

Expected time infected COVID-19 individual will recover or die.

W_s

Expected time of a COVID-19 infected individual will have to wait before he or she is being recovered or dead.

L_n

Expected number of cumulative COVID-19 cases in a country excluding times when there are no new cases.