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<div>Dear Vladimir V. Kisil,</div>
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<div>Thanks very much for suggestion to use expand() method on e3 first.</div>
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<div>And I have given a look at the source code at power::to_polynomial</div>
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<div><a href="https://www.ginac.de/reference/normal_8cpp_source.html#l02688" id="LPNoLPOWALinkPreview">https://www.ginac.de/reference/normal_8cpp_source.html#l02688</a></div>
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<div> 2688 ex power::to_polynomial(exmap & repl) const</div>
<div> 2689 {</div>
<div> 2690 if (exponent.info(info_flags::posint))</div>
<div> 2691 return pow(basis.to_rational(repl), exponent);</div>
<div> 2692 else if (exponent.info(info_flags::negint))</div>
<div> 2693 {</div>
<div> 2694 ex basis_pref = collect_common_factors(basis);</div>
<div> 2695 if (is_exactly_a<mul>(basis_pref) || is_exactly_a<power>(basis_pref)) {</div>
<div> 2696 // (A*B)^n will be automagically transformed to A^n*B^n</div>
<div> 2697 ex t = pow(basis_pref, exponent);</div>
<div> 2698 return t.to_polynomial(repl);</div>
<div> 2699 }</div>
<div> 2700 else</div>
<div> 2701 return pow(replace_with_symbol(pow(basis, _ex_1), repl), -exponent);</div>
<div> 2702 } </div>
<div> 2703 else</div>
<div> 2704 return replace_with_symbol(*this, repl);</div>
<div> 2705 }</div>
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<div>and I wonfer if there is a typo on line <span style="caret-color:rgb(0, 0, 0);background-color:rgb(255, 255, 255);display:inline !important">2691, the <span style="caret-color:rgb(0, 0, 0);background-color:rgb(255, 255, 255);display:inline !important">basis.to_rational
can be replaced with <span style="caret-color:rgb(0, 0, 0);background-color:rgb(255, 255, 255);display:inline !important">basis.to_polynomial?</span></span></span></div>
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<div>Best regards!</div>
Feng<br>
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