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作者lompt
相反的
你看英文的卻沒這樣縮寫
此外這邊只是單純舉例省略乘號
回到問題
乘號可以一律省略嗎?
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In algebra, multiplication involving variables is often written as a juxtaposition (e.g. xy for x times y or 5x for five times x). This notation can also be used for quantities that are surrounded by parentheses (e.g. 5(2) or (5)(2) for five times two).
明明就有寫....
乘號只能以定義中列舉的方式省略。所以 ab = (a x b) 的爭議在於定義上無此表示法。
當然前提是你覺得wiki權威度夠。如果你覺得你有其他權威的參考，拿出來討論當然很歡迎。