Numerical shadow
Example of a product numerical shadow restricted to real states
of matrix
\[\begin{pmatrix} 1&1&1&1\\ 0&i&1&1\\ 0&0&-1&1\\ 0&0&0&-\ii \end{pmatrix}\]is forming an image of $\mathbb{R}P^1 \times \mathbb{R}P^1$.
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- Łukasz Pawela
- Piotr Gawron
- Jarosław Adam Miszczak
- Zbigniew Puchała
- Karol Życzkowski
- Paulina Lewandowska
- Ryszard Kukulski