Sun The sun is the center of the solar system, it is a star, a hot ball of glowing gases. Supply To furnish organs, tissues or cells with a vital element as blood or never fibers. Support To keep going, to uphold. Surroundings The circumstances, conditions or objects by which one is surrounded.
1. Solving Differential Equations (DEs). A differential equation (or DE) contains derivatives or differentials. Our task is to solve the differential equation. This will involve integration at some point, and we'll (mostly) end up with an expression along the lines of  y = ....
More about Algebraic Equation. An algebraic equation is formed by connecting two expressions using an assignment operator denoting the equality of the two sides. It gives that the left hand side is equal to the right hand side. For example, x -2x+1=0 and x/y-4=3x +y are algebraic equations.