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83 if (
mag(t.
xy()) < SMALL &&
mag(t.
yx()) < SMALL)
90 scalar mb = t.
xx() + t.
yy();
91 scalar c = t.
xx()*t.
yy() - t.
xy()*t.
yx();
101 scalar disc =
sqr(mb) - 4*c;
105 scalar q =
sqrt(disc);
113 <<
"zero and complex eigenvalues in tensor2D: " << t
136 if (
mag(t.
xy()) < SMALL &&
mag(t.
yx()) < SMALL)
138 if (lambda >
min(t.
xx(), t.
yy()))
147 else if (
mag(t.
xy()) < SMALL)