Over-rated China

[bigbadwolf]

A piece of satire.

China Overrated by Right-Wing Kooks

These Crazies Are Just Like Hitler

www.unz.com

 

[jerryjin]

Another piece of satire.

USA Covid-19 stats as of 15-Jul-20:

United States

Confirmed 3.48M +61,834

Recovered 1.03M

Deaths 138K +787

 

[Daniel Duffy]

How many students know the chain rule, let's say transforming from (x,t) to (z, tau)

z = z(x,t) = x/s(t)
tau = t

Now transform heat equation

u_t = u_xx for 0 < x < s(t)

to a PDE in z and tau for 0 < z < 1.

// 95% get it wrong first time.

Hint; use the chain rule and z is a function of TWO variables.