by hypothesis h(x) is differentiable and h'(x)=0 at some point c of (a, b),
then 0=h'(c)=f'(c)-(f(b)-f(a))/(b-a),
that is f'(c)=(f(b) -f(a))/(b-a)

#calculus

Spacetime #pythagorastheorem Minkowski version

Riemann sphere #complex #calculus

Riemann vs Lebesgue #integrals #calculus

Another one:
In lexicographical order c<s, also 90<180

#angles

32.5=31.5

Be careful, it's easy to introduce logical gaps in visuals.

x,y ∈ ℕ | x²+y²=c ⇒ ∃ w,z ∈ ℕ | w²+z²=2c

Milü, approximations to #pi

Approximation to #pi using Monte Carlo Integration

Gauss-Jordan reduction #matrix

Limit definition of the #derivative #calculus

#integrals #byparts

#pascalstriangle patterns