Two hyperlinks in the ebook Biasing calculations don't work.
The first is TR One, Ch 9 .
The second is crystal radio, Ch 9 .

 

The emitter-bias equations have been repeated in Figure below with the internal emitter resistance included for better accuracy. The internal emitter resistance is the resistance in the emitter circuit contained within the transistor package. This internal resistance REE is significant when the (external) emitter resistor RE is small, or even zero. The value of internal resistance RE is a function of emitter current IE, Table below.

Well for me re is a small-signall resistance between base and emitter when we looking into emitter with base short to ground (short for AC signal via capacitor) re = dVbe/dIe. And for DC re = 0Ω
And by a small-signal I mean that BJT is already properly bias and work in active region. So for me it is a mistake to mixing a small-signal parameters with DC current one.

 

Two hyperlinks in the ebook Biasing calculations don't work.
The first is TR One, Ch 9 .
The second is crystal radio, Ch 9 .

Indeed, the links aren't functional.
Thank you for your observation.