Thoughts: One of the great things about Mathematics is how things get built upon each other, into wildly new fields, yet retaining fundamental concepts, and being relatable to other field: c and d are functions of ax+by and ax+by+cz respectively, and this also relates to the function focused aspect of the fundamentals of calculus, in that we can say y=f(x)=ax+by+cz. Also, we know that we are dealing with real numbers, due to the nature of the coordinate system not being complex, so we can assume that a,b,c,x,y,z∈R, which is the set of real numbers for which they have membership, so there are even reminisces of set theory hidden within this. This makes sense though, because the foundations of mathematics have been set theoretic since the early 1900's.
Due to the deep interrelation of Mathematics and Physics, there is inherent tension between the two fields, perceived by mathematicians, physicists and mathematical physicists. Also, an attempt is made to explain why mathematical rigor is typically unwelcome in Physics.