I don't follow the last implication here: [![notes][1]]
How does for all $t \in [0,1]$ $$ \frac{t}{2} ||y||^2 + x^Ty \geq 0 $$ imply that $ x^Ty \geq 0$? [1]: https://i.stack.imgur.com/IJM8o.jpg
2026-03-18 10:22:01.1773829321
valid proof of geometry for inner product of two vectors
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