I personally do not like to have underscores in labels. They make them 
longer, and the added value is not so high. Maybe for the given example 
("sqr2irr" -> "sqrt_2_irr") this approach looks reasonable (although the 
"underscore version" is not really more comprehensible compared with 
sqrt2irr, from my point of view), but here are some additional examples:

   - vtocldf -> v_to_cl_d_f
   - recclzi -> rec_cl_z_i?
   - leaddsub -> le_add_sub?
   - brprcneu -> br_prc_n_eu?
   - elfzom1p1elfzo -> el_fzo_m1_p1_el_fzo or even el_fzo_m_1_p_1_el_fzo?

Do we really want such labels? Are they really more comprehensible? I doubt 
this...

Alexander

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