Higher order temporal finite element methods through mixed formalisms

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Table 5 Eigenvalues of A in MCAP algorithms

Algorithms	Eigenvalues
Jquad	$λ_{1, 2} = \frac{6 m a - 2 h^{2} \pm i \sqrt{36 h^{2} m a - 3 h^{4}}}{6 m a + h^{2}}$
Uquad	$λ_{1, 2} = \frac{6 m a - 2 h^{2} \pm i \sqrt{36 h^{2} m a - 3 h^{4}}}{6 m a + h^{2}}$
UJquad	$λ_{1, 2} = \frac{h^{4} - 60 a m h^{2} + 144 m^{2} a^{2} \pm i (12 h) \|12 a m - h^{2}\| \sqrt{a m}}{h^{4} + 12 a m h^{2} + 144 m^{2} a^{2}}$