Comment on the paper "Analysis of activation energy and entropy generation in mixed convective peristaltic transport of Sutterby nanofluid, T. Hayat, Z. Nisar, A. Alsaedi, B. Ahmad, Journal of Thermal Analysis and Calorimetry (2021) 143:1867–1880".

The correct form is 5 HT <math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mtext>Gc</mtext><mo>=</mo><mfrac><mrow><mi>g</mi><msub><mi> </mi><mtext>f</mtext></msub><msub><mi> </mi><mtext>C</mtext></msub><mspace width="0.277778em" /><mrow><mo stretchy="false">(</mo><mi>C</mi><mo>-</mo><msub><mi>C</mi><mn>0</mn></msub><mo stretchy="false">)</mo></mrow><mspace width="0.277778em" /><msubsup><mi>d</mi><mrow><mn>1</mn></mrow><mn>2</mn></msubsup></mrow><mrow><mi> </mi><mi>c</mi></mrow></mfrac></mrow></math> ht Graph Fourth error (serious) The equation (21) in [[1]] is as follows 6 HT <math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mfrac><mrow><mi> </mi><mi> </mi></mrow><mrow><mi> </mi><mi>y</mi></mrow></mfrac><mo>±</mo><mi> </mi><mfenced close="]" open="["><mrow><mfrac><mrow><msup><mi> </mi><mn>2</mn></msup><mi> </mi></mrow><mrow><mi> </mi><msup><mi>y</mi><mn>2</mn></msup></mrow></mfrac><mo>-</mo><mi>B</mi><msup><mfenced close=")" open="("><mfrac><mrow><msup><mi> </mi><mn>2</mn></msup><mi> </mi></mrow><mrow><mi> </mi><msup><mi>y</mi><mn>2</mn></msup></mrow></mfrac></mfenced><mn>3</mn></msup></mrow></mfenced><mo>=</mo><mn>0</mn></mrow></math> ht Graph Equation (6) is a dimensionless equation presented in [[1]] after the non-dimensionalization in equation (17) in [[1]]. [Extracted from the article]