Changes

Try to clarify aspect ratio. (#2528)

Closes #2515

Clarify that locally non-singular can combine to give a global singularity. (#2529)

Note that locally non-singular may combine to globally non-singular or globally singular;
and the latter is the exception that should be mentioned.
Closes #2510

Remove default tab from text.

Try to clarify aspect ratio. (#2528)

Closes #2515

Clarify that locally non-singular can combine to give a global singularity. (#2529)

Note that locally non-singular may combine to globally non-singular or globally singular;
and the latter is the exception that should be mentioned.
Closes #2510

Remove default tab from text.