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https://ask.libreoffice.org/en/question/136850/how-to-insert-delta-and-nebula-inside-the-basic-shapes-in-libre-impress-office/
Thread: https://ask.libreoffice.org/en/question/136850/how-to-insert-delta-and-nebula-inside-the-basic-shapes-in-libre-impress-office/
Here a shape, a text box, and a 'Math' formula are inserted independently.
The shape and the text box are native to the drawing
while the formula is an OLE object created by 'Math' and editable by 'Math'.
Now the famous Δ-formula: