Gauss, at 21, wrote the world’s 1st Number Theory Book “Disquisitiones Arithmeticae” on his famous inventions (Modulus arithmetic, Quadratic Reciprocity Theorem, 17-sided polygon). It was rejected by Paris Academy of Science. The French rejection caused him a life-long reluctance, like Newton, to publish his works (e.g. Non-Euclidean Geometry). He also erased all the proofing steps, only showed the end results.