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The online version of Introduction to Quantum Information Science by Artur Ekert, Tim Hosgood, Alastair Kay, and Chiara Macchiavello

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Dear Tim, I also would like to make a remark on some statements in 1.2.1: '..it must have, somehow, experienced the two paths...' '..because it has travelled through both...' I...

Hi, thanks for writing the book. It looks nice. There is a small typo of basis. [L1021](https://github.com/thosgood/qubit.guide/blob/8e36f0a714f84f9bbb47028c757ecc219f3ec2fb/source/02-qubits.Rmd#L1021) and L1027

Line 108 of [04-measurement.Rmd](https://github.com/thosgood/qubit.guide/blob/main/source/04-measurement.Rmd) should be `$\bra{a}\ket{b}\bra{b}\ket{a}$` instead of `$\bra{a}\ket{b}\ket{b}\bra{a}$`. The Projector `\ket{b}\bra{b}` is sandwiched between`\bra{a}\ket{a}`

Add minus sign to the equation for `p` and add Hamiltonian mechanics link from Wikipedia

correction