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Superscripts, Subscripts, And Level Indicators

1. In an unspaced expression the baseline indicator must be used to be used after a superscript or subscript to indicate a return to the baseline of writing. However, the baseline indicator must not be used to return to the baseline after a numeric subscript not requiring a subscript indicator.
   1. a²+b²+c²
      

   2. 4(x-y)³-2(x-y)³
      

   3. 3a³b + 6a⁶b² + 9a⁹b³
      

   4. 
      

   5. xⁿ - dimensional system
      

   6. 6²- or 6 x 6- is 36.
      

   7. 7₈ - 4₈
      

   8. a_ib_jc_kd_l
      

   9. five₃+five₃
      

   10. a₁a₂ + b₁b₂ + c₁c₂
       

   11. v = v₁i₁ + v₂i₂ + . . .
       

   12. a₀b_k + a₁b_k-1 + . . . + a_kb₀
       

2. The baseline indicator must be placed before a sign of grouping when a level indicator is in effect and the grouping symbol appears on the baseline of writing. However, the baseline indicator must not be placed after a numeric subscript not requiring a subscript indicator.
   1. (x² + y²) - (x² + y²)
      

   2. (a²)⁸(+2b)³
      

   3. {f_n}
      

   4. Ia_m-a_nI
      

   5. (x₁y₁+x₂y₂)
      

   6. ([CH₃]₂CH)
      

   7. f₁(x) = g(x) "·" q₂(x)+f₂(x)
      

3. No space should be left between an abbreviation and a related indicator. When it is necessary to return to the baseline, no space should be left before the baseline indicator.
   1. 144 ft² + 144 ft²
      

   2. 2 m³ + 2 m³
      

   3. 2 m. ³ + 2 m. ³