xiànxìngsuànzi
ㄒㄧㄢˋ ㄒㄧㄥˋ ㄙㄨㄢˋ ˙ㄗ
Simplified 线性算子
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 線性算子 and it comes back until you know it.