Commentary on [16 ],  and 
Holmgren’s proof of the uniquesness theorem for solutions of differential equations with analytical coefficients (in two variables) remained a rather isolated fact for half a century. However, the paper  by Fritz John, partly announced in , brought the proof to a central place in the theory of analytic differential equations by showing how old and new theorems on analyticity of solutions could be obtained from it. The importance of this connection is undiminished today, but the relationships have been reversed during the past decade so that analyticity theorems now come first and uniqueness theorems come second.
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