Greek letters in formulas?

I just encountered a question which had a formula in LaTeX syntax, like so:

$$\frac{d\phi}{dt} = F(x, v)\ \ ,\ \ x = A\cos(\omega t + \phi) \ \ ,\ \ v = -A\omega\sin(\omega t + \phi)$$

LaTeX support "will never be on SO", so I replaced this with the following:

dφ/dt = F(x, v),
x = A*cos(Ωt + φ),
v = -A*Ω*sin(Ωt + φ)


I felt that gave a concise and readable formula. But is the use of Greek letters desired/recommended, or should I have spelt them out like phi, omega etc, in case people somehow don't have support for Greek characters in their browsers? Or to make the formula less math-like and more code-like, maybe?

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How about d&phi;/dt = F(x,v), and v = -A&Omega;sin(&Omega;t + &phi;)? –  WChargin Jun 4 '13 at 1:15
By the way if that's a pendulum I believe it should be a lowercase ω. –  WChargin Jun 4 '13 at 1:16

Since this is Stack Overflow we're talking about, I'd go for "make the formula less math-like and more code-like." The question is tagged , so use that if you can. If not, pseudocode that uses variable names like phi and omega in place of Greek letters should be fine.