Introduction
I. ORIGINS OF SWING AMPLIFICATION
- Cambridge union
Swing amplification
Spiral regeneration, take two
Transient growth and asymptotic stability
Spiral stellar wakes
The roads part
II. THE LIN-SHU THEORY GOES ON
- Neutral modes and marginally stable disk
Antispiral theorem
Spiral shock waves and induced star formation
Extremely satisfactory comparisons?
III. SHARPER FOCUS
- A feel of group velocity
Group properties of tightly wrapped packets
Sources of spiral waves
IV. GATHERING IN BASEL
- Astronomers' applause
Distinct cautions
AFTERWORD
REFERENCES
