“…The concept was not introduced by Johann Jensen in 1912 as sometimes claimed, but probably earlier by Edmond Maillet [26] in 1903 (see also Otto Reimerdes' paper [31] of 1911). Differential geometric properties of analytic landscapes have been studied in quite a number of early papers (see Ernst Ullrich [34] and the references therein). Jensen [19] and others also considered the graph of |f | 2 , which is a smooth surface.…”
“…The concept was not introduced by Johann Jensen in 1912 as sometimes claimed, but probably earlier by Edmond Maillet [26] in 1903 (see also Otto Reimerdes' paper [31] of 1911). Differential geometric properties of analytic landscapes have been studied in quite a number of early papers (see Ernst Ullrich [34] and the references therein). Jensen [19] and others also considered the graph of |f | 2 , which is a smooth surface.…”
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