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Deriving the put-call parity
I am looking at the proof of the put-call parity, $P+S=C+Ee^{-rT}$
The proof begins by defining two portfolios with same strike price $E$ and time to expiry $T$:
1. A call $C(E,T)$ plus cash ...
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Option Theta: What conditions are needed for Theta > P/N, where P = option price, and N = days to expiration?
The wikipedia definition for Theta is:
And people frequently refer to the picture below, to show what typically happens with an option's value as a function of time; we can note this is ...
