Definition df-itv

Description: Define the Interval (segment) index extractor for Tarski geometries. (Contributed by Thierry Arnoux, 24-Aug-2017) Use its index-independent form itvid instead. (New usage is discouraged.)

	Ref	Expression
Assertion	df-itv	$$⊢\mathrm{Itv}=\mathrm{Slot}16$$

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		citv	$$class\mathrm{Itv}$$
1		c1	$$class1$$
2		c6	$$class6$$
3	1 2	cdc	$$class16$$
4	3	cslot	$$class\mathrm{Slot}16$$
5	0 4	wceq	$$wff\mathrm{Itv}=\mathrm{Slot}16$$