Errata for Contact Structures of Partial Differential Equations
 p. 8:
 Remark 1.2.15: line 6: dot should be a comma
 p. 39:
 Section 2.3: line 2: \Gr_k instead of \Gr_2
 p. 49:
 line 7: x_0 should be L_0
 p. 52:
 line 1: 'compact hyperbolic surface' should be 'connected hyperbolic surface'
 Example 2.3.7: line 2: remove "compact"
 p. 53:
 Example 2.3.8: "over" should be "cover"
 p. 58:
 line 6:
l_2(b_0)
should bel_1(b_0)
 p. 59:

Example: Compact surfaces of type (2', 3'):

Roughly 9th line:
\pi_2
should be\pi_{1,3}
 The dot after the definition of F'_L should be removed
 line 10:
\pi_2 \comp \sigma
should be\pi_2' \comp \sigma
 line 7: 'This is map' should be ' This is a map'

Roughly 9th line:
 p. 62:
q_{r1}
should ber_{11}
 p. 6365
 The term 'free' should be 'effective' (occurs multiple times)
 p. 63:
 fourth display on page: indices should be subscript
 p. 63:
 line 6:
q_{22}
should ber_{22}
 p. 65:
 line 3:
two out of
should readone out of
 p. 70:
 In formula 2.22, structure equation for \eta'':
\eta' \wedge \eta''
should beeta' \wedge \zeta''
.  p. 141
 In the section on hyperbolic exterior differential systems we do not require the hyperbolic exterior differential systems to be closed. In the literature it is more common to require an hyperbolic EDS to be closed.
 p. 192:
 comma in first display