What does [x] means in mathematics ?

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Discussion Overview

The discussion revolves around the meaning of the notation [x] in mathematics, specifically whether it represents the greatest integer less than or equal to x. Participants explore various interpretations and implications of this notation in different contexts.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant claims that [x] means "the greatest integer <= x" and provides examples for verification.
  • Another participant suggests that while the greatest integer interpretation is common, it can vary by context and advises checking the definitions in specific texts.
  • A participant questions the distinction between the definition provided and the floor function, \lfloor x \rfloor, suggesting they are equivalent.
  • One participant argues against the idea of a unique use of symbols, stating that context clarifies meaning.
  • Another participant emphasizes the importance of the definition at hand and the flexibility of notation in mathematics.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of [x], with some supporting the greatest integer definition while others highlight the variability of notation across different contexts. The discussion remains unresolved regarding the correctness of specific examples and the implications of notation usage.

Contextual Notes

There are unresolved assumptions regarding the definitions of notation in various mathematical texts, and the discussion reflects a lack of consensus on the interpretation of [x].

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what does [x] means in mathematics ?

i have found [x]= "the greatest integer <=x "

is this true ?

then, what will be the answer of of ...
[3],[1.5],[-1.5],[3.5]




i am trying to answer, please correct me

[3]=3
[1.5]=1
[-1.5]=-1
[3.5]=3

are these correct ?
 
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[] meaning greatest integer is a common use of the [], but it can vary.You should check whatever book your problems are from, they should define what they mean by the notation.

If it is the greatest integer function, then "[-1.5]=-1" isn't correct. You want the greatest integer less than or equal to -1.5, so it can't be -1 as -1.5<-1.
 
So, in what way is the definition for [ x ] you've given different from \lfloor x \rfloor ? - also given to be the symbol for the floor function, which matches the definition you gave.

None, AFAIK, just a "who's the author" thing.

IMO, it's just a bad nomen confusum problem. I've also seen it used in characteristic functions. Somebody ought to pick one use, and pitch the rest... :) and penalize deviating authors 10 points for misuse. :)
 
Rubbish, Jim: there are far too few symbols possible and far too meanings that need to be conveyed. Context makes it clear what is going on.
 
Uniqe and fossilized use of symbols is counter-productive of developing flexibility of the mind. It is the definition AT HAND that matters, and if the chosen notation is convenient for its purpose.
 

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