發送短信 : On the spectral radius of convolution dilation operators

 __   _     _____     _  __     ___     _    _   
| || | ||  |  ___||  | |/ //   / _ \\  | \  / || 
| '--' ||  | ||__    | ' //   | / \ || |  \/  || 
| .--. ||  | ||__    | . \\   | \_/ || | .  . || 
|_|| |_||  |_____||  |_|\_\\   \___//  |_|\/|_|| 
`-`  `-`   `-----`   `-` --`   `---`   `-`  `-`