这些你都知道吗？以后给老外作报告的时候可千万别再“The equation is like this…”, “The value is like this…” 有些公式不好写，能看出来什么意思就行了。 1.Logic ?there exist ?for all p?q p implies q / if p, then q p?q p if and only if q /p is equivalent to q / p and q are equivalent 2.Sets x∈A x belongs ...