<position> is the position of the container (expressed through coordinates). <fill> is how much you want to fill the tank, expressed in 100 units. So, 100 is full, 0 is empty, 50 is half, and so on. Output Code \documentclass[margin=10pt]{standalone} \usepackage{tikz} \usetikzlib...
We use the following notation for points of Ω and their coordinates: ( x , y ) ∈ Ω , x = ( x 1 , … , x d ) ∈ ω , y ∈ ( 0 , 1 ) , and the following abbreviated notation for partial derivatives: ∂ x i m f ( t , x , y ) = ∂ m ∂ x i m f (...