# Prithwijit De

**Designation: ASSOCIATE PROFESSOR (G)**

**Alumnus of Indian Statistical Institute, Kolkata (B.Stat, M.Stat) and National University of Ireland, Cork (Ph.D) **

**Professional Experience: **

1. Associate Professor: July, 2020 -

Reader: July, 2012 - June, 2020

Fellow: April, 2010 - June, 2012

1.1 National Coordinator, Mathematical Olympiad (email: nc_matholy@hbcse.tifr.res.in)

1.2 Regional Coordinator, Mumbai region (email: rcmumbai@hbcse.tifr.res.in)

2. Associated with the Mathematical Olympiad programme (http://olympiads.hbcse.tifr.res.in/subjects/mathematics/mathematics-cell) in India.

**International experience**:

i) Leader of the Indian team to the European Girls' Mathematical Olympiad 2020, Egmond aan Zee, The Netherlands (virtual)

ii) Leader of the Indian team to the European Girls' Mathematical Olympiad 2018, Florence, Italy

iii) Leader of the Indian team to the International Mathematical Olympiad 2016, Hong Kong

iv) Observer A of the Indian team to the International Mathematical Olympiad 2015, Chiang Mai, Thailand.

v) Observer A of the Indian team to the International Mathematical Olympiad 2014, Cape Town, South Africa.

vi) Deputy Leader of the Indian team to the International Mathematical Olympiad 2011, Amsterdam, The Netherlands.

3. I have participated as a resource person in various Mathematics Olympiad training camps at both regional (RMOTC) and national level (INMOTC).

4. Member of the Editorial Committee of ''At Right Angles'', a publication of Azim Premji University together with Community Mathematics Centre, Rishi Valley, India (http://www.azimpremjiuniversity.edu.in/publications).

##
**Educational Qualification: **

1. B. Stat (Hons), Indian Statistical Institute, Kolkata.

2. M. Stat, Indian Statistical Institute, Kolkata.

3. Ph.D (Statistics), National University of Ireland, Cork, Republic of Ireland.

**Publications**:

**I. Articles **

21. The Odd-Even Tale

Prithwijit De

At Right Angles (India), pp.126 - 129, Vol.7, No.2, July 2018

20. On an Optimization Problem

Prithwijit De

At Right Angles (India), pp. 80 - 82, Vol.7, No.1, March, 2018

19. A Geometric Inequality and its Generalization

Prithwijit De

The Mathematics Teacher, pp. 4 - 10, Vol. 53, Issues 3 and 4, 2017.

18. A Triangle Problem and Three Variants

Prithwijit De

At Right Angles (India), pp. 31 - 36, Vol. 6, No. 3, November, 2017

17. LFHC - Area, Perimeter and Congruency (APC)

Prithwijit De, Swati Sircar, Sneha Titus

At Right Angles (India), pp. 53 - 58, Vol. 6, No. 3, November, 2017

16. On Problem Posing

Prithwijit De

At Right Angles (India), pp. 82 - 85, Vol. 6, No. 2, August, 2017

15. The Arithmetic Mean - Geometric Mean - Harmonic Mean Inequalities and a Spectrum of Applications

Prithwijit De

Resonance, pp. 1119 - 1133, Vol. 21, Issue 12, December, 2016

14. An Eye on Eyeball

Prithwijit De

At Right Angles (India), pp. 34-37, Vol. 5, No.2, July, 2016

13. A Golden Maximum.

Prithwijit De

Mathematical Spectrum (U.K), pp. 132-133, May, 2014.

12. A Fair Division.

Prithwijit De, Sneha Titus, Swati Sircar

At Right Angles (India),pp.31-34,Vol. 3, No.1,March,2014

11. Always a Cube.

Prithwijit De

Mathematical Spectrum (U.K), pp.29-33, September, 2012.

10. A Sweetseller’s Trick.

Prithwijit De

At Right Angles (India), pp. 17-19, Vol 1, No. 1, June, 2012.

9. Height of Difficulty.

Prithwijit De

Mathematical Spectrum (U.K), pp. 80-85, January, 2012.

8. Message in a Bottle.

Prithwijit De

Mathematical Spectrum (U.K), pp. 50-52, January, 2011.

7. A Pouring Problem.

Prithwijit De

Mathematical Spectrum (U.K), pp. 3-5, September, 2010.

6. Caught up in a Box.

Prithwijit De

Mathematical Spectrum (U.K), pp. 115-121, May, 2010.

5. A Farmer and a Fence.

Prithwijit De

Mathematical Spectrum (U.K), pp.75-82, January, 2010.

4. Curious properties of the circumcircle and incircle of an equilateral triangle.

Prithwijit De

Mathematical Spectrum (U.K), pp.32-36, September, 2008.

3. A pair of insoluble Diophantine equations arising from an equilateral triangle.

Prithwijit De

Mathematical Gazette (U.K), July, 2008.

2. Radii of touching circles: a trigonometric solution.

Prithwijit De

Mathematical Spectrum (U.K), pp. 70-74, January, 2009.

1. From Immersion Heaters to Buoys.

Prithwijit De, Des MacHale

Mathematical Gazette (U.K), pp.519-521, November, 2007.

**II**. **Problems for which my solution was either published or acknowledged. **

### 1. **American Mathematical Monthly (MAA publication)**

website: **http://www.maa.org/publications/periodicals/american-mathematical-monthly**

**Total: 61**

**2022: (4+) **

12184 (with B.Sury), 12190 (February, 2022), 12231(Aug-Sep, 2022), 12238 (December, 2022)

**2021: (6)**

12165 (November, 2021)

12154 (Aug - Sep, 2021)

12147 (June - July, 2021)

12140 (with B. Sury), 12144 (May, 2021)

12123 (February, 2021)

**2020: (2)**

12083, 12086 (August - September, 2020)

**2019: (1)**

11961 (Jan, 2019)

**2018: (5)**

11942 (Aug-Sep, 2018)

11905 (February 2018)

11890, 11897, 11899 (January 2018)

**2017: (2)**

**11881 **(December, 2017)

11857 (May, 2017)

**2016: (6)**

11816, 11822 (with B. Sury and N. V. Tejaswi)

11815( Nov, 2016)

11754 (Mar 2016)

11737, 11758 (Jan 2016)

**2015: (2)**

11714 (Jun-Jul, 2015)

11690 (Mar, 2015)

**2014: (3)**

11663, 11670 (Oct, 2014)

**11630 (Jan, 2014)**

**2013: (2)**

11622 (Dec, 2013)

11596 (May, 2013)

**2012: (5)****11552, **11554 (Oct, 2012)

11550 (Aug-Sep, 2012)

11509 (May 2012)

11511 (pp.69-70, January, 2012)

**2011: (4)**

11486, 11492 (November, 2011)

11457 (April, 2011)

11443 (March, 2011)

**2010: (3)**

11386 (May, 2010)

11385 (March, 2010)

11357 (February, 2010)

**2009: (3)**

11325 (Aug-Sep, 2009)

11301, 11306 (Jan, 2009)

**2008: (6)**

11289 (October, 2008)

11275 (Sep, 2008)

11245 (May, 2008)

11263 (April, 2008)

11240 (February, 2008)

11228 (January, 2008)

**2007: (6)**

11177 (pp.838,November, 2007)

11210, 11211, 11225 (October, 2007)

11160, 11168 (May, 2007)

**2006: (1)**

10483 (Jun-Jul, 2006)

**2. Crux Mathematicorum** (**A renowned problem solving journal published by the Canadian Mathematical Society**)

website: **https://cms.math.ca/crux/**

**Total: 208**

**2022: (32+)**

Sep 2022: OC 568, OC 569

Jun 2022: **MA152, MA154, **(MA155)

May 2022: **4694, **(4695**, **4698),** **4699, **4700**

Mar - Apr, 2022: **4671**, 4672, 4676, **4680**, 4684, 4688, **MA 136**, MA 137, MA 142, MA 145, OC 551, OC 554

Jan - Feb, 2022: 4656, 4658, **4661**, 4664, 4665, 4666, 4667, MA 131, MA 132, MA 133, OC 536, OC 537, OC 541

**2021: (21)**

Dec 2021: 4643

Nov 2021: 4637, 4639

Sep 2021: OC518, OC519

June 2021: **MA105**, 4602, 4604, 4606

May 2021: 4591, **4593 **

April 2021: 4581, 4586, OC 503

March 2021: 4579, 4580

February 2021: 4562, OC 491, OC 495

January 2021: 4560, OC489

**2020: (27)**

December 2020: 4541,4545, 4547, **4549**

November 2020: 4532, **4535**

October 2020: 4522, 4523, 4524, 4525, 4526, 4529, OC473, OC474

September 2020: 4511, 4512, 4516, 4518, 4519, OC468

June 2020: 4504, 4505, 4508

April 2020: 4482

May 2020: OC 459

March 2020: **4472 **

Feb 2020: 4470

**2019: (14)**

Nov 2019: 4432, **4435, **4440

Oct 2019: 4422, OC 425

Sep 2019: **4413**, **4415**, 4416, 4419

July 2019: 4383, 4385, 4386

May 2019: 4366

Mar 2019: 4335

**2018: (15)**

Sep 2018: 4269

Apr 2018: 4233, **4237, **CC267

Mar 2018: OC 311, OC 312, **4221, 4224**

Feb 2018**: **4215, 4219

Jan 2018: 4204**, 4206, OC301, **OC302, OC303

**2017: (17)**

Dec 2017: 4192, **4197**

Nov 2017: 4184, 4189

Oct 2017: 4171, 4175, **4177**, CC239

Sep 2017: 4161

**Jun 2017: 4160**

Mar 2017: **4126** , 4129

Feb 2017: CC206, CC210, 4116, **4117**

Jan 2017: 4108

**2016: (17)**

Dec 2016: **4095**, **4099, **CC200

Oct 2016: 4074, 4077, 4079, 4080, OC240.

Sep 2016: OC 233

May 2016: 4041, **4047**, 4048, **4049**, 4050

Apr 2016: 4037

Feb 2016: 4011

Jan 2016: 4008

**2015: (15)**

Dec 2015: 3993, 3994, 3997, 3998

Oct 2015: 3971, 3974

May 2015: **3948**

Apr 2015: 3931 (pp.173-174), 3933 (pp.175-177), 3934 (pp.177), 3937 (pp.182), 3939 (pp.184-185)

Feb 2015: 3911 (pp.78-79), 3912 (pp.79-80)

Jan 2015: 3903 (pp.34 - 35)

**2014: (23)**

Dec 2014: **3891 **(pp.439-440), 3897 (pp.447-448), 3898 (pp.448-449), 3899 (pp.449 - 451)

Nov 2014: **3882 **(pp.396-397); 3885 (pp.399-400)

Sep 2014: 3862 (pp. 303); **3866** (pp. 307-309)

Jun 2014: 3853 (pp. 264); 3855 (pp.265); 3856 (pp.266)

May 2014: 3841 (pp.217-218)

April 2014: 3832 (pp. 168-171); 3833 (pp. 171-172); ** 3834 (pp.172-173)**

Mar 2014: 3822 (pp.125-126); 3828 (pp. 131-132)

Feb 2014: 3812 (pp.77-78); **3814 (pp.80-81)**; 3816 (pp.84-85); 3818 (pp.86-87)

Jan 2014: 3807 (pp.40-41), 3808 (pp. 41-42)

**2013: (9)**

Nov 2013: 3782 (pp. 419-420), 3783 (pp. 420-421)

Sep 2013: 3763 (pp. 328-330)

Jun 2013: 3753 (pp. 279-280), 3755 (pp. 281-282)

May 2013: 3749 (pp. 242-243)

April 2013: 3731 (pp.189)

March 2013: **3727 (pp.151-152)**, 3728 (pp.153)

**2012: (9)**

June 2012: 3660 (pp.256)

May 2012: 3643 (pp.203), **3647 (pp. 208 - 209)**

April 2012: 3632 (pp.154-155), 3635 (pp. 158-159)

March 2012: 3627 (pp.116-117)

February 2012: **3611 (pp.71)**, 3613 (pp.73)

January 2012: 3609 (pp.39-40)

**2011: (9)**

December 2011: 3598 (pp.556-557)

November 2011: 3576 (pp.463-464), 3577 (pp.464-465)

October 2011: 3556 (pp.395-396)

April 2011: 3528 (pp.178-179), 3532 (pp.184-185)

Mar 2011: 3514 (pp.117), 3525 (pp.127)

Feb 2011: 3505 (pp.57)

**3. The College Mathematics Journal** **(MAA publication)**

website: **http://www.maa.org/publications/periodicals/college-mathematics-journal/the-college-mathematics-journal**

September 2015: 1031 (pp.301-302), 1034 (pp. 305-306)

May 2014: 1003 (pp.224-226)

March 2014: 998 (pp.148-149)

January 2014: 995 (pp.63-64)

November 2013: 989 (pp. 442-444)

March 2013: 971 (pp.143), 972 (pp.144), 973 (pp.144-146), **974 (pp.146-147)**, 975 (pp.147-148)

September 2009: 883 (pp.297-299), 885 (pp.301-303)

May 2009: 877 (pp.217-218)

**4. The Mathematical Gazette (UK)**

website: **http://www.m-a.org.uk/jsp/index.jsp?lnk=620**

November 2021: 105.C

March 2021: 104.E

July 2017: 100.K (pp.342)

March 2017: 100.F (pp.154-156)

July 2012: 95.I (pp.352)

**5. Mathematics Magazine** **(MAA publication) **

website: **http://www.maa.org/publications/periodicals/mathematics-magazine**

June 2021: 2100

January 2021: 2086 (with B.Sury),

February 2019: 2037

February 2018: 2012

December 2017: 2004 (pp. 387)

October 2017: 1997 (pp.301-302)

December 2015: 1952 (pp.379-380)

February 2015: 1936 (pp.74-75)

February 2014: 1911 (pp.63)

December 2013: 1906 (pp. 383)

April 2013: 1891 (pp.148-149)

June 2012: 1873 (pp.231-232)

April 2008: 1767 (pp. 157)

October 2007: 1754 (pp.312)

April 2007: 1743 (pp. 148), 1744 (pp. 148-149)

February 2007: 1736 (pp.78-79), 1738 (pp.80)

June 2006: 1723 (pp.221-222)

**6. Irish Math.Soc.Bulletin**

website:** http://www.maths.tcd.ie/pub/ims/bulletin/**

Winter 2012: **68.2 (pp.70-71) **

Winter 2013: **70.1 (pp.102-103)**

Winter 2017: 78.1 (pp.88), 78.2 (pp.89-90)(jointly with Prof. Finbarr Holland)

Winter 2021: **86.2**

**7. Mathematical Excalibur (Hong Kong)**

website: **https://www.math.ust.hk/excalibur/**

Problem 415 (pp.4, Vol. 17, No. 5, March-April, 2013)

Problem 466 (pp.3, Vol. 20, No. 1, July - October, 2015)

Problem 468 (pp.3, Vol. 20, No. 1, July - October, 2015)

Problem 486 (pp.3, Vol. 20, No. 5, Aug - September, 2016)

Problem 489 (pp.3, Vol. 20, No. 5, Aug - September, 2016)

**Problem 491 (pp.3, Vol. 21, No.1, Oct 2016 - March 2017)**

**Problem 526, 527 (pp.3, Vol 22, No.3, Feb - April, 2019)**

**Problem 531 (pp.3, Vol.22, No.4, May - October, 2019)**

### 8. Mathematical Reflections {http://awesomemath.org/mathematical-reflections/}

Mathematical Reflections 5 (2016): J385 (pp.1), J389 (pp.5), S385 (pp.7), O385 (pp.20), O386 (pp.21)

Mathematical Reflections 2 (2016): S371 (pp.11)

Mathematical Reflections 3 (2015): J339 (pp.3), S338 (pp.9)

Mathematical Reflections 1 (2015): S327 (pp.11-12), U326 (pp.17)

Mathematical Reflections 6 (2014): J320

Mathematical Reflections 5 (2014): J313 (pp.1), J317 (pp.6), S314 (pp.9), S315 (pp.10), S316 (pp.11-12), S317 (pp.13)

Mathematical Reflections 4 (2014): J308 (pp.2), J311 (pp.5), J312 (pp.6), S307 (pp.7), U309 (pp.15)

Mathematical Reflections 2 (2014): J295 (pp.1)

Mathematical Reflections 3 (2013): J265 (pp.1).

Mathematical Reflections 1 (2013): J256 (pp.4), S253 (pp.7).

Mathematical Reflections 6 (2012): J249 (pp.3), S247 (pp.7), S248 (pp.8).

Mathematical Reflections 5 (2012): J243 (pp.3), S241 (pp.7), S245 (pp.11), O241 (pp.21).

Mathematical Reflections 4 (2012): J235 (pp.1), J237 (pp.3), S235 (pp.7).

Mathematical Reflections 2 (2012): J223 (pp.1), J225 (pp.3), S224 (pp.8), S228 (pp.12).

Mathematical Reflections 6 (2011): S211 (pp.7).

Mathematical Reflections 5 (2011): J199 (pp.1), J200 (pp.2), S201 (pp.9).

Mathematical Reflections 3 (2011): J188 (pp.2), J191 (pp.5), J192 (pp.6-7), S187 (pp.8), S190 (pp.11).

Mathematical Reflections 2 (2011): S181 (pp.8).

Mathematical Reflections 1 (2011): J175 (pp.1).

Mathematical Reflections 4 (2010): J163 (pp.1), J167 (pp.6), S164 (pp.11), S168 (pp. 17-18).

## III. Problems whose solutions were submitted and awaiting publication/acknowledgement

1. American Mathematical Monthly: 12253.

2. CRUX Mathematicorum: 4705, 4722, 4726, 4728, 4754, 4755, 4764, 4769, OC 561, OC 564, OC580, OC593, OC 596, MA146, MA147, MA149, MA150, MA155, MA160, MA165, MA171, MA174, MA178, MA180, MA192

3. The College Mathematics Journal:

4. Mathematics Magazine: 2133

5. Mathematical Reflections:

6. Irish Math. Soc. Bulletin:

7. Mathematical Excalibur:

8. Mathematical Gazette: 106.C

## Teaching Experience at Undergraduate and Postgraduate Level (taught at Centre for Excellence in Basic Sciences, Mumbai):

1. Jan - Apr, 2019: **Discrete Mathematics**

2. Aug-Nov, 2018: **Number Theory**

3. Jan-Apr, 2015: **Differential Equations and Dynamical Systems; Graph Theory**

4. Aug-Nov, 2014: **Introduction to Calculus**. (course shared)

5. Aug-Nov, 2013: **Introduction to Calculus****.** (course shared)

6. Aug-Nov, 2012: **Discrete Mathematics****.**

## **Involvement in the Mathematical Olympiad Programme:**

**International Level**

** 2020: Leader (EGMO)**

** 2018: Leader (EGMO)**

** 2016: Leader (IMO)**

** **2015: Observer A (IMO)

2014: Observer A (IMO)

2011: Deputy Leader of the Indian IMO team.

**National Level**

1. Faculty for the International Mathematical Olympiad Training Camp (IMOTC).

2. Faculty for the EGMO Training Camp: 2018, 2019

3. Faculty for the following Indian National Mathematical Olympiad Training Camp(s) (INMOTC)

*2020: Delhi; Mumbai, Maharashtra; Sikkim; Kolkata, West Bengal; Chennai, Tamil Nadu

* 2019: Mumbai, Maharashtra; SMIT, Majitar, Sikkim; Kochi, Kerala; Bangalore, Karnataka

* 2018: Mumbai, Maharashtra; JNV Rural, Bangalore, Karnataka; Kochi, Kerala; Chennai, Tamil Nadu

* 2017: Chennai, Tamil Nadu; Bangalore, Karnataka.

* 2015: Bangalore, Karnataka; Mumbai, Maharashtra; Chennai, Tamil Nadu.

∗ 2014: Bangalore, Karnataka; Dhamtari, Chhattisgarh; Chennai, Tamil Nadu.

∗ 2013: Chandigarh, Punjab; Raipur, Chhattisgarh; Chennai, Tamil Nadu.

∗ 2012: Durg, Chhattisgarh; Kolkata, West Bengal; Chennai, Tamil Nadu.

∗ 2010: Mumbai, Maharashtra.

**Regional Level**

* 2022: Taught at the Mathematical Olympiad Camp in Imphal, Manipur organized by the Department of Mathematics, Manipur University and the Manipur Mathematical

Society in September 2022.

Faculty for the following Regional Mathematical Olympiad Training Camp(s) (RMOTC)

* 2017: IMA, Bhubaneshwar.

* 2016: IMA, Bhubaneshwar.

* 2015: Pachhunga University College, Aizawl, Mizoram

* 2014: IMA, Bhubaneswar; Manipur University, Imphal, Manipur; Assam Academy of Mathematics, Guwahati, Assam; North Eastern Hill University, Shillong, Meghalaya

∗ 2013: Jawahar Navodaya Vidyalaya, Thiruvananthapuram; Atomic Energy Central School 4, Aunushaktinagar, Mumbai; IMA, Bhubaneswar.

∗ 2012: Jawahar Navodaya Vidyalaya, Thiruvananthapuram; Atomic Energy Central School 4, Aunushaktinagar, Mumbai; Parle Tilak

Vidyalaya, Vile Parle, Mumbai, IMA, Bhubaneshwar.

∗ 2011: Atomic Energy Central School 4, Anushaktinagar, Mumbai.

∗ 2010: Atomic Energy Central School 4, Anushaktinagar, Mumbai.

## Talks/Lectures

November 2022: Delivered an online lecture at the 59th Annual Conference of the Gujarat Ganit Mandal.

Title of the talk: **Mathematical Problem-solving in School**

May 2022: At Right Angles Webinar: "**A Mathematical Take Away**"

November 2021: Delivered a lecture at the Undergradute Colloquium of the Department of Mathematics of** Illinois State University, USA**.

Title of the talk: **Some Geometry Problems in Real Life**

October 2018: Delivered a lecture at JSO-JMO, 2018 organised by Atomic Energy Education Society and held at Atomic Energy Junior College, Anushakti Nagar, Mumbai

October 2017: Delivered a lecture at JSO -JMO, 2017 organised by Atomic Energy Education Society and held at Atomic Energy Junior College, Anushakti Nagar, Mumbai

July 2017: Conducted a session on "Problem Solving and Designing" in APU-HBC-RMS workshop at HBCSE, Mumbai

November 2016: Conducted four sessions on Trigonometry for in-service teachers of Delhi Public School from all over India in a programme held at Delhi Public School, R. K. Puram, New Delhi

October 2016: Lectured Gujarat RMSA Teachers. Title: **Interesting Problems for the Classroom**

Lectured JSO/ JMO students at AECS 3. Title: **Triangle Centres and their properties**.

May 2016: Lectured KV TGT teachers on Problem Solving at HBCSE, Mumbai, India

November 2015: Delivered a talk on "**Pythagorean Triples and Much More**" at the INSPIRE Programme in Kolkata organized by Jagadis Bose

Centre for Excellence, Kolkata.

June, 2013: Delivered a talk on “Misconceptions in Mathematics” in a programme entitled “Innovative Teaching Techniques” organized by

BASE, Mumbai.

February, 2013: Conducted a session on Geometry for Teacher Educators from Gujarat. This was a part of the Teachers’ Professional Development

programme held at HBCSE.

September, 2012: Delivered a talk on mathematical problem solving to school teachers at a workshop organised by BASE at Nehru Science Centre, Mumbai.

February, 2012: Delivered a talk at the NCERT camp at HBCSE, Mumbai

December, 2011: Delivered a talk at the INSPIRE camp at Vaze College, Mumbai.

December, 2011: Delivered two lectures at the Professional Development and Technology Orientation Programme (PDTO) workshop organized by

the Department of Mathematics, Indian Institute of Tecnology, Mumbai.

October, 2011: Delivered a talk on Geometry at a science camp entitled New Horizon of Science organized by Jagadish Bose Science Talent

Search, Kolkata in association with DST, Govt. of India.

February, 2011: Delivered two lectures to NTS awardees at HBCSE, Mumbai.

July, 2010: Delivered two lectures at a Secondary School Teachers’ Training Programme organised by BASE.

## Workshops