v0.8.28

refined det syntax

v0.8.27

refined bilinear forms

v0.8.26

fixed some rare bugs

v0.8.25

refined interior syntax

v0.8.24

fixed some syntax errors

v0.8.23

resolved syntax errors

v0.8.22

minor tensor revision

v0.8.21

refined tensor contractions

v0.8.20

some internal edits

v0.8.19

defined robust MetricTensor algebra