I How do you move floors and ceilings in discrete math?

AI Thread Summary
The discussion focuses on how to manipulate logarithmic and ceiling functions within discrete mathematics. Participants clarify that to eliminate a logarithm, one can exponentiate the expression using its base. The challenge arises when dealing with ceiling functions, where the inequality must be carefully analyzed to find the maximum value that satisfies the condition. It is suggested that stating the entire problem can provide better context for solving issues related to ceilings. Overall, the conversation emphasizes the importance of understanding the properties of logarithmic and ceiling functions in solving inequalities.
iScience
Messages
466
Reaction score
5
The title more accurately should have been "How do you cancel floors and ceilings in discrete functions"

For instance,

##\frac{log{\frac{3x}{-6(z)}}}{8t} < 1##

If I wanted to get rid of the log, I'd just raise the expression by base 10.

##\frac{(\frac{3x}{-6(z)})}{10^{8t}} < 10^1##

But what happens if there's a roof for discrete functions?

##\frac{\lceil{log \frac{10x}{4y}}\rceil}{8z} < 1##

How do I handle this?

-----------------------------------------------------------------------------------

EDIT NOTICE: the expressions above have been fixed into its their proper inequalities
 
Last edited:
Mathematics news on Phys.org
iScience said:
For instance,

##\frac{log{\frac{3x}{-6(z)}}}{8t}##

If I wanted to get rid of the log, I'd just raise the expression by base 10.

##\frac{(\frac{3x}{-6(z)})}{10^{8t}}##
i rather hope you would not do that, since it is wrong.
 
oops, sorry, here's the other side

##\frac{log(stuff)}{8t} < 1 ##

##\frac{stuff}{10^{8t}} < 10 ##
 
iScience said:
oops, sorry, here's the other side

##\frac{log(stuff)}{8t} < 1 ##

##\frac{stuff}{10^{8t}} < 10 ##
Still wrong.

##\frac{\log(stuff)}{8t} < 1 ##
##\log(stuff)<8t##
##stuff<10^{8t}##
For your ceil question, it might help if you state the entire problem.
 
iScience said:
But what happens if there's a roof for discrete functions?

##\frac{\lceil{log \frac{10x}{4y}}\rceil}{8z} < 1##
Assuming z>0, z>0 leads to a very similar case:
##\lceil{stuff\rceil} < 8z##
What is the largest value of stuff that satisfies the inequality? Once you found that, you can continue with the usual approaches.
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
Fermat's Last Theorem has long been one of the most famous mathematical problems, and is now one of the most famous theorems. It simply states that the equation $$ a^n+b^n=c^n $$ has no solutions with positive integers if ##n>2.## It was named after Pierre de Fermat (1607-1665). The problem itself stems from the book Arithmetica by Diophantus of Alexandria. It gained popularity because Fermat noted in his copy "Cubum autem in duos cubos, aut quadratoquadratum in duos quadratoquadratos, et...
Thread 'Imaginary Pythagorus'
I posted this in the Lame Math thread, but it's got me thinking. Is there any validity to this? Or is it really just a mathematical trick? Naively, I see that i2 + plus 12 does equal zero2. But does this have a meaning? I know one can treat the imaginary number line as just another axis like the reals, but does that mean this does represent a triangle in the complex plane with a hypotenuse of length zero? Ibix offered a rendering of the diagram using what I assume is matrix* notation...
Back
Top