I create a formula, select it, right-click, select "Object...", click on "Type"
tab.  There are "Size" and "Position" sections displayed.  In the "Position"
section is a line that begins with "Vertical".  It looks like this:

    Vertical  [Bottom]    by [0.00cm]   to [Base line]

The way this is worded ("bottom ... to base line") I am led to expect that the
Bottom of the frame will be positioned on the base line; thus the frame will be
above the base line.  And when it looks like this:

    Vertical  [ Top  ]    by [0.00cm]   to [Base line]

I am led to expect that the top of the frame will be positioned on the base
line; thus the frame will hang below the base line.

The problem is that the reverse of this is true.  In the first case the frame is
below and in the second case the frame is above.  This confused me for quite a
long time before I figured out what was wrong.

Second: From the right-click menu I can click on "Alignment" and adjust the same
values as I adjusted earlier via Object...|Type|Vertical.  It is rather
confusing that these two interfaces have different wordings for the same settings.

Alignment             Object|Type|Vertical   reality
----------            --------------------   -------
base line at top    = Top to Base line       bottom at baseline 
base line centered  = Center to Base line    center at baseline
base line at bottom = Bottom to Base line    top at baseline