The economist and demographer David Lam, in his magisterial 2011 presidential address to the Population Association of America, identified the keys to global prosperity in the face of record rates of population growth.

Although both physicians were connected with official commissions, they were unable to get three passages on a river steamer for another half month. This boat, going only midway to Chungking, would land them at Ichang. There they would have to find further accommodations on some vessel specially constructed to negotiate Upper Yangtze rapids and whirlpools.

Let B be the homogeneous prime ideal of V, H a hyperplane in the projective space corresponding to the linean form l, and put C= V◦H.

For example, one addict would crack shorts (break and enter cars) and usually obtain just enough stolen goods to buy stuff and get off just before getting sick.