What does $QAQ^{-1}$ actually mean? - Mathematics Stack Exchange I'm self-learning Linear Algebra and have been trying to take a geometric approach to understand what matrices mean visually I've noticed this matrix product pop up repeatedly and can't seem to de
abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$ Can you think of some way to
How can 1+1=3 be possible? - Mathematics Stack Exchange You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
Formula for $1^2+2^2+3^2+. . . +n^2$ - Mathematics Stack Exchange The factor 1 3 attached to the n3 n 3 term is also obvious from this observation You can use induction to show that the lower-order terms can be dealt with using lower order expressions (so assume that the natural numbers and units have already been summed using expressions of degree 2 and 1 respectively)