What's the real number sign with a + under it?

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Homework Help Overview

The discussion revolves around the interpretation of a mathematical notation representing real numbers with a plus sign underneath. Participants are exploring its meaning and context within mathematical literature.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Some participants express uncertainty about the notation, with one attempting to find information online. Others suggest it typically denotes positive real numbers, while one notes it may also refer to non-negative real numbers depending on context.

Discussion Status

The conversation is ongoing, with various interpretations being discussed. Some participants have offered potential meanings, but there is no explicit consensus on the notation's definition.

Contextual Notes

Participants mention that the notation may appear differently in various contexts, such as being used as a power rather than a subscript, indicating a possible variation in usage across different mathematical texts.

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Homework Statement


What does the real number sign with a + under it mean? Check the example below.

Homework Equations


http://upload.wikimedia.org/wikibooks/en/math/8/d/3/8d380fa4b673b84ddb613bed8ab8f189.png


The Attempt at a Solution


Tried Googling, but didn't find anything.
 
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I've never seen this notation, but i'd say it means the positive real numbers.
 
It typically means positive real numbers, or occasionally non-negative real numbers depending on the context and how lazy the author is
 
Just to mention it... normally you find it (I found it...) as a power rather than as a subscript!
 

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