January 31st, 2016, 06:56 PM  #11 
Senior Member Joined: Oct 2013 From: New York, USA Posts: 637 Thanks: 85 
y = x^2 is a function. x = y^2 is not a function because a value of x goes with two values of y. For example, (4, 2) and (4, 2) are both on x = y^2.

January 31st, 2016, 09:04 PM  #12 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  
January 31st, 2016, 09:06 PM  #13 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  Yeah I know, I just made a stupid mistake when I typed that... It was late at night and I was sleepy, but I was waiting for my printer to finish printing my notes, so I decided to visit this site lol.

February 2nd, 2016, 07:45 PM  #14 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,622 Thanks: 2611 Math Focus: Mainly analysis and algebra  

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