Send the following on WhatsApp
Continue to ChatPositive Linear Operators Preserving $\tau $ and $\tau ^{2}$ - https://dergipark.org.tr/tr/pub/cma/issue/45605/547221
Positive Linear Operators Preserving $\tau $ and $\tau ^{2}$ - https://dergipark.org.tr/tr/pub/cma/issue/45605/547221