I found a equation in my physics book of Omega ( In alternte current chapter) there is written both signs plus minus and minus plus , now I'm confused.
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Nothing special... $\mp:=-(\pm)$ – Math Attack Sep 20 '23 at 09:03
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1top with top and bottom with bottom. – C.F.G Sep 20 '23 at 09:04
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Usually, this means that the two signs are related and negatives. So $\pm a\mp b$ means $+a-b$ or $-a+b.$ – Thomas Andrews Sep 20 '23 at 09:30
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When you see $\mp$, you will usually also see a $\pm$ somewhere in the same expression. It conventionally means that whatever sign you choose for one of them, you choose the opposite for the other. For instance, the expression $a\pm b\mp c$ represents the two options $a+b-c$ and $a-b+c$.
Arthur
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2There is yet another use of $\mp$ like in: $a_0-a_1+a_2\mp\cdots$ where it indicates alternating signs, but starting with $-$, where $\pm$ would start alternation with a $+$. – emacs drives me nuts Sep 20 '23 at 09:11