3.1.2. Drawing a reaction step rule

In this subsection 4.1.2 the relation more than includes equality.

For distinct expressions p,q,r there are two methods to draw an arrow in a reaction step rule to move a (single) bond from the line (p,q) to the edge (q,r):

1. method Select the line (p,q) by pressing the mouse button with the cursor at less than 10 pixels from it and more than 8 from its ends p,q. Then release the mouse button with the cursor at less than 10 pixels from the edge (q,r) and more than 8 from its ends r,q.

2. method Press the mouse button with the cursor in a position closer to p than to q, less than 10 pixels from the line (p,q) and more than 8 from p and successively release the mouse button with the cursor at less than 8 pixels from r. The bond can be imagined to turn around q from p to r.

These two methods to draw an arrow in a reaction step rule are represented in the figures below. Figure 4.1 shows the 1. method, Figure 4.2 the 2. method. The mouse cursor must be pressed in the red dashed area and subsequently released in the green area.

Figure 4.1

Figure 4.2

Two kinds of arrows can appear. If some line joins q with r a circular arrow is drawn (Figure 4.3), otherwise a straight arrow pointing to r is produced (Figure 4.4).

Figure 4.3

Figure 4.4

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