I am trying to draw a line (or an arc) in Adobe Illustrator that looks something like this:
(Picture taken from Allen Hatcher’s “Notes on Introductory Point-Set Topology,” pp. 22.)
My problem is that I can’t place the arrowhead exactly halfway on the curve between the endpoints, or on any point on the curve.
Can anyone please help me?
Answer
Step1: Create 4 circles
Step 2: remove unwanted arcs (joining strokes is not necessary, but optional if you want to play around with anchors)
Step 3: Copy top 2 arcs into new layer (when pasting, use cnrl+shift+alt+v to paste in exacly same place) and add arrow ends
Step 4: Show both layers (note – otherwise, have undesirable stroke endings meeting arrowheads)
Step 5: Add circles & letters
Note: If for math publication, you might want to create using TEX as opposed to Illustrator (there is a good Tex SE) for more professional finish/ proper mathematical fonts, etc
Attribution
Source : Link , Question Author : Behrooz , Answer Author : martin