#  Reflection Positivity and the Schur Product Theorem 

 



 ![Jefferson Laboratory at Harvard University is where Osterwalder and Schrader discovered the “reflection positivity” property in 1972, the concept behind this “picture proof” of the Schur Product Theorem](/sites/g/files/omnuum6611/files/mathpicture/files/jefferson_rf1.jpg)

 

 Jefferson Laboratory at Harvard University is where Osterwalder and Schrader discovered the “reflection positivity” property in 1972, the concept behind this “picture proof” of the Schur Product Theorem.

 The corresponding paper with the title *Quantum Fourier Analysis* by Arthur Jaffe, Chunlan Jiang, Zhengwei Liu, Yunxiang Ren, and Jinsong Wu can be found at <https://arxiv.org/abs/2002.03477>.