Zusammenfassung
The process of photon splitting \$\gamma\$ in a strong
magnetic field is investigated both below and above the pair creation
threshold. Contrary to the statement by Baier et al., the ``allowed'' channel
\$\alw\$ is shown not to be a comprehensive description of splitting in the
strong field because the ``forbidden'' channel \$\frb\$ is also essential. The
partial amplitudes and the splitting probabilities are calculated taking
account of the photon dispersion and large radiative corrections near the
resonance.
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