![Reporters Without Borders (RSF) secretary-general Christophe Deloire (right), director of operations and campaigns Rebecca Vincent (left) and Julian Assange's wife Stella Assange outside Belmarsh Prison, south-east London, where they are visiting the Reporters Without Borders (RSF) secretary-general Christophe Deloire (right), director of operations and campaigns Rebecca Vincent (left) and Julian Assange's wife Stella Assange outside Belmarsh Prison, south-east London, where they are visiting the](https://c8.alamy.com/comp/2PJWK67/reporters-without-borders-rsf-secretary-general-christophe-deloire-right-director-of-operations-and-campaigns-rebecca-vincent-left-and-julian-assanges-wife-stella-assange-outside-belmarsh-prison-south-east-london-where-they-are-visiting-the-wikileaks-founder-the-visit-comes-a-week-before-the-four-year-anniversary-of-his-imprisonment-in-belmarsh-picture-date-tuesday-april-4-2023-2PJWK67.jpg)
Reporters Without Borders (RSF) secretary-general Christophe Deloire (right), director of operations and campaigns Rebecca Vincent (left) and Julian Assange's wife Stella Assange outside Belmarsh Prison, south-east London, where they are visiting the
![Gabriel Peyré on X: "Only + and - operations: Walsh-Rademacher-Hadamard vs Haar transforms. Dense vs sparse (for piecewise constant inputs). https://t.co/ipXOKRorZ3 https://t.co/X7gOV6aQEE https://t.co/YbYAjta0vI" / X Gabriel Peyré on X: "Only + and - operations: Walsh-Rademacher-Hadamard vs Haar transforms. Dense vs sparse (for piecewise constant inputs). https://t.co/ipXOKRorZ3 https://t.co/X7gOV6aQEE https://t.co/YbYAjta0vI" / X](https://pbs.twimg.com/media/EwEUFQIWQAABzD5.jpg:large)
Gabriel Peyré on X: "Only + and - operations: Walsh-Rademacher-Hadamard vs Haar transforms. Dense vs sparse (for piecewise constant inputs). https://t.co/ipXOKRorZ3 https://t.co/X7gOV6aQEE https://t.co/YbYAjta0vI" / X
![Gabriel Peyré on X: "Only + and - operations: Walsh-Rademacher-Hadamard vs Haar transforms. Dense vs sparse (for piecewise constant inputs). https://t.co/ipXOKRoZOB https://t.co/X7gOV6bouc https://t.co/faTjbh4s8M" / X Gabriel Peyré on X: "Only + and - operations: Walsh-Rademacher-Hadamard vs Haar transforms. Dense vs sparse (for piecewise constant inputs). https://t.co/ipXOKRoZOB https://t.co/X7gOV6bouc https://t.co/faTjbh4s8M" / X](https://pbs.twimg.com/media/FznuSgJWAAQseG1.jpg)