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<!-- l2h_begin sing_l2h 1 -->
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$$\partial_t \eta (t) = g(\eta(t),\varphi(t))$$ ''
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<!-- l2h_end sing_l2h 1 -->

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<!-- l2h_begin sing_l2h 2 -->
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$--a {\frac{1}{2}} @minus{}$
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<!-- l2h_end sing_l2h 2 -->

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<!-- l2h_begin sing_l2h 3 -->
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$--a@minus{} {\frac{1}{2}}$
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<!-- l2h_end sing_l2h 3 -->

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\end{document}
