Hashtags List:
#angles
#anglesum
#byparts
#calculus
#catalannumbers
#circle
#complex
#cos
#determinant
#derivative
#divisibilityrules
#epsilondelta
#eulersidentity
#function
#geometry
#goldenratio
#GramSchmidt
#graphtheory
#hyperbolic
#inf
#integrals
#jensensinequality
#log
#matrix
#maximal
#minimal
#parabola
#pascalstheorem
#pi
#pythagorastheorem
#pythagoreanidentities
#quotientgroup
#rational
#realnumbers
#ruleandcompass
#sets
#series
#sin
#spanishmnemonics
#sup
#tan
#taylorpolynomial
#torus
#trigonomcetricidentities

#angles #sin #cos

#angles #sin #cos

Any point on torus lies on four circles on #torus.

Lagrange's Mean Value Theorem #calculus

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