This facsimile page from Gauss' diary 1796 18141985 dates from the year before he received his doctorate from Göttingen. The terse nature of these entries makes translation difficult, but the highlighted note [84] is most probably related to the partial classification of ternary quadratic forms that appears in his famous Disquisitiones Arithmetica Gauss (1801) where he also demonstrated the ruler-and-compass constructibility of the regular 17-gon.
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Figure 5 Facsimile page from Gauss' Diary ... |  |
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Figure 6 ...and its typewritten transcription |  |