construct proofs (in the same fashion that was demonstrated in the video lectures)
to show that the following sequents are valid.
1. (–q --> –p), p ⊢ q
2. (p --> (m --> r), m ⊢ p--> r
3. w--> (s--> (b--> r)) ⊢b--> (w--> (s--> r))
4. –t--> –r ⊢ r--> t

What's the denominator

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for