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Calculus is based upon functions that are defined in a coordinate system. So Descartes' work of Cartesian coordinates lay the foundation for Newton and Leibniz to invent the Calculus. For example, in order to calculate the area below a curve, you must have a function $f(x)$ to express the curve based on Cartesian coordinate before integration and the area is $$ A=\int_a^b f(x)\:dx $$ Furthermore, this fundamental contribution of Descartes goes far beyond geometry because the physical quantities such as force, distance, time, velocity, work and so on, are also based on Cartesian coordinates. This means that many notions in physical sciences like mechanic, electricity, thermodynamics, chemistry and so on, can be based on Cartesian coordinates as well.

For example, the acceleration that is proportional to the force is the derivative of the distance function with respect to time $$ F=m\cdot a=m\cdot s''(t) $$ To calculate work by force, we need first to express force as a function with respect to distance and then integrate as $$ W=\int_C F(s)\:ds $$ Thus in order to do Calculus, you need functions expressed in Cartesian coordinate system first.

Calculus is based upon functions that are defined in a coordinate system. So Descartes' work of Cartesian coordinates lay the foundation for Newton and Leibniz to invent the Calculus. For example, in order to calculate the area below a curve, you must have a function $f(x)$ to express the curve based on Cartesian coordinate before integration and the area is $$ A=\int_a^b f(x)\:dx $$ Furthermore, this fundamental contribution of Descartes goes far beyond geometry because the physical quantities such as force, distance, time, velocity, work and so on, are also based on Cartesian coordinates. This means that many notions in physical sciences like mechanics, electricity, thermodynamics, chemistry and so on, can be based on Cartesian coordinates as well.

For example, the acceleration that is proportional to the force is the derivative of the distance function with respect to time $$ F=m\cdot a=m\cdot s''(t) $$ To calculate work by force, we need first to express force as a function with respect to distance and then integrate it as $$ W=\int_C F(s)\:ds $$ Thus in order to do Calculus, you need functions expressed in the Cartesian coordinate system first.

Calculus is based upon functions that are defined in a coordinate system. So Descartes' work of Cartesian coordinates lay the foundation for Newton and Leibniz to invent the Calculus. For example, in order to calculate the area below a curve, you must have a function $f(x)$ to express the curve based on Cartesian coordinate before integration and the area is $$ A=\int_a^b f(x)\:dx $$ Furthermore, the physical quantities such as force, distance, time, velocity, work and so on, are also based on Cartesian coordinates. For example, the acceleration that is proportional to the force is the derivative of the distance function with respect to time $$ F=m\cdot a=m\cdot s''(t) $$ To calculate work by force, we need first to express force as a function with respect to distance and then integrate as $$ W=\int_C F(s)\:ds $$ Thus in order to do Calculus, you need functions expressed in Cartesian coordinate system first.

Calculus is based upon functions that are defined in a coordinate system. So Descartes' work of Cartesian coordinates lay the foundation for Newton and Leibniz to invent the Calculus. For example, in order to calculate the area below a curve, you must have a function $f(x)$ to express the curve based on Cartesian coordinate before integration and the area is $$ A=\int_a^b f(x)\:dx $$ Furthermore, this fundamental contribution of Descartes goes far beyond geometry because the physical quantities such as force, distance, time, velocity, work and so on, are also based on Cartesian coordinates. This means that many notions in physical sciences like mechanic, electricity, thermodynamics, chemistry and so on, can be based on Cartesian coordinates as well. 

For example, the acceleration that is proportional to the force is the derivative of the distance function with respect to time $$ F=m\cdot a=m\cdot s''(t) $$ To calculate work by force, we need first to express force as a function with respect to distance and then integrate as $$ W=\int_C F(s)\:ds $$ Thus in order to do Calculus, you need functions expressed in Cartesian coordinate system first.

Calculus is based upon functions that are defined in a coordinate system. So Descartes' work of Cartesian coordinates lay the foundation for Newton and Leibniz to invent the Calculus. For example, in order to calculate the area below a curve, you must have a function $f(x)$ to express the curve based on Cartesian coordinate and the area is $$ A=\int_a^b f(x)\:dx $$ Furthermore, the physical quantities such as force, distance, time, velocity, work and so on, are also based on Cartesian coordinates. For example, to calculate work by force, we need first to express force as a function with respect to distance and then integrate as $$ W=\int_C F(s)\:ds $$

Calculus is based upon functions that are defined in a coordinate system. So Descartes' work of Cartesian coordinates lay the foundation for Newton and Leibniz to invent the Calculus. For example, in order to calculate the area below a curve, you must have a function $f(x)$ to express the curve based on Cartesian coordinate before integration and the area is $$ A=\int_a^b f(x)\:dx $$ Furthermore, the physical quantities such as force, distance, time, velocity, work and so on, are also based on Cartesian coordinates. For example, the acceleration that is proportional to the force is the derivative of the distance function with respect to time $$ F=m\cdot a=m\cdot s''(t) $$ To calculate work by force, we need first to express force as a function with respect to distance and then integrate as $$ W=\int_C F(s)\:ds $$ Thus in order to do Calculus, you need functions expressed in Cartesian coordinate system first.