Theorem elico1

Description: Membership in a closed-below, open-above interval of extended reals. (Contributed by NM, 24-Dec-2006) (Revised by Mario Carneiro, 3-Nov-2013)

	Ref	Expression
Assertion	elico1	$$⊢\left(A\in {ℝ}^{*}\wedge B\in {ℝ}^{*}\right)\to \left(C\in \left[A,B\right)\leftrightarrow \left(C\in {ℝ}^{*}\wedge A\le C\wedge C<B\right)\right)$$

Proof

Step	Hyp	Ref	Expression
1		df-ico	$$⊢\left[.\right)=\left(x\in {ℝ}^{*},y\in {ℝ}^{*}⟼\left\{z\in {ℝ}^{*}|\left(x\le z\wedge z<y\right)\right\}\right)$$
2	1	elixx1	$$⊢\left(A\in {ℝ}^{*}\wedge B\in {ℝ}^{*}\right)\to \left(C\in \left[A,B\right)\leftrightarrow \left(C\in {ℝ}^{*}\wedge A\le C\wedge C<B\right)\right)$$