What Does 21/2 Represent in Mathematics?

  • Thread starter Thread starter mikedamike
  • Start date Start date
mikedamike
Messages
28
Reaction score
0
Hi,

This is no doubt a real simple question

does 21/2 mean 20.5 or 21

Thanks in advance

Mike
 
Mathematics news on Phys.org
mikedamike said:
Hi,

This is no doubt a real simple question

does 21/2 mean 20.5 or 21

Thanks in advance

Mike

It means 20.5 or √2

Why would it mean 21 ?
 
Sorry, i was 99.99% sure it was 2^0.5 but it was one of those questions you ask when your brain gets wound up from learning a new equation and then you take a step back and its blindingly obvious. Thanks for reply though.
 
1 is NOT the same as 1/2!
 
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