The second variation formula for harmonic mappings

The second variation formula for harmonic mappings
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by R. T. Smith

Proc. Amer. Math. Soc. 47 (1975), 229-236

DOI: https://doi.org/10.1090/S0002-9939-1975-0375386-2

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The formula of the title is computed, and is used to calculate the index and nullity in several cases.

References

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