Find Covariance Matrix for c1,c2 Given x,y=7,4

na4aq
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if you've got c1=2x+3x, and c2=x-y, with cov matrix x,y = [7 4].how do you find C = (c1,c2)transpose?
 
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Thank you for helping out.. EnumaElish. Its all clear now.
 

Thread 'Deductive proof in logic formal systems'

I was reading documentation about the soundness and completeness of logic formal systems. Consider the following $$\vdash_S \phi$$ where ##S## is the proof-system making part the formal system and ##\phi## is a wff (well formed formula) of the formal language. Note the blank on left of the turnstile symbol ##\vdash_S##, as far as I can tell it actually represents the empty set. So what does it mean ? I guess it actually means ##\phi## is a theorem of the formal system, i.e. there is a...
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