I tried to have a semicolon between the xt-d and gamma in the label of y axis instead of the comma. May i know how to do it? Thanks!

curve((1+exp(-1*x))^-1,xlim=c(-10,10),ylim=c(0,1),main="Logistic function",xlab=expression ("x"[t-d]),ylab=expression ("G"("x"[t-d],gamma,c)))
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