Jan 20, 2019
Ø, fold, cusp, swallowtail, butterfly
#catastrophe#fold#cusp#swallowtail#butterfly#ℂ³→ℂ#Peter Slodowy#Friedrich Hierzebruch#algebraic geometry#umbilic#René Thom#hyperbolic#elliptic#singularities#algebraic varieties#parabolic#polynomials#multivariate#Felix Klein#John Milnor#variety#varieties#geometry#catastrophe theory#rank#dihedral group#alternating group#group theory#ℂ#ℂ→ℂ