# What is the name of theorem 1?

What is the name of theorem 1?

## What is the name of theorem 1?

Theorem 1: Equal chords of a circle subtend equal angles, at the centre of the circle. Converse of Theorem 1: If two angles subtended at the centre, by two chords are equal, then the chords are of equal length.

What is the most famous theorem?

The Pythagorean Theorem is arguably the most famous statement in mathematics, and the fourth most beautiful equation.

### What is meant by Thales theorem?

In geometry, Thales’ theorem states that if A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ABC is a right angle. Thales’s theorem is a special case of the inscribed angle theorem and is mentioned and proved as part of the 31st proposition in the third book of Euclid’s Elements.

Does the Cantor–Schroeder–Bernstein theorem hold in a Boolean topos?

However, the theorem actually requires only excluded middle, although it does not hold in constructive mathematics — indeed, it is actually equivalent to excluded middle (at least assuming the axiom of infinity ). We prove that the Cantor–Schroeder–Bernstein theorem holds in a Boolean topos.

#### What is the Schröder–Bernstein theorem?

In set theory, the Schröder–Bernstein theorem states that, if there exist injective functions f : A → B and g : B → A between the sets A and B, then there exists a bijective function h : A → B.

What is the Cantor-Schröder-Bernstein theorem?

This is called the Cantor-Schröder-Bernstein Theorem. See Wikipedia for another writeup. First a reminder of some relevant definitions: A function f: A → B is one-to-one if for all x 1 and x 2 ∈ A, f ( x 1) ≠ f ( x 2) unless x 1 = x 2.

## Does EM constructively follow from the Cantor-Schroeder-Bernstein statement?

In fact EM does constructively follow from the Cantor-Schroeder-Bernstein statement provided that a natural numbers object exists; see Pradic and Brown, 2019. A proof that in a topos CSB+NNO implies Booleanness is outlined in Freyd 1994.