Meaning of R++Date: 9/12/96 at 13:41:50 From: Alexander Cook Subject: Meaning of R++ Dear Dr. Math, What do the symbols R_{+} and R_{++} mean? I have never seen this notation before. Please, tell me. Alexander Cook Date: 9/13/96 at 11:22:55 From: Doctor Ken Subject: Re: Meaning of R++ Hello! The symbol R_+ means "all real numbers x such that x > 0." I'm not sure what R_++ means, but it's probably something like R_+, and maybe now you can figure it out based on the context. It might be worth noting that sometimes, in some books, the authors use R_+ to mean "all real numbers x such that x >= 0 (greater than or equal to)," but it's more standard to mean greater than (at least in America). -Doctor Ken, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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